参考代码：

def reverse_int(x):
    if not isinstance(x, int):
        return False
    if -10 < x < 10:
        return x
    tmp = str(x)
    if tmp[0] != '-':
        tmp = tmp[::-1]
        return int(tmp)
    else:
        tmp = tmp[1:][::-1]
        x = int(tmp)
        return -x
reverse_int(-23837)