123688 has 8 divisors (see below), whose sum is σ = 231930. Its totient is φ = 61840.

The previous prime is 123677. The next prime is 123701. The reversal of 123688 is 886321.

It can be written as a sum of positive squares in only one way, i.e., 116964 + 6724 = 342^2 + 82^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an Ulam number.

It is a plaindrome in base 10 and base 15.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7723 + ... + 7738.

2¹²³⁶⁸⁸ is an apocalyptic number.

It is an amenable number.

123688 is a deficient number, since it is larger than the sum of its proper divisors (108242).

123688 is a wasteful number, since it uses less digits than its factorization.

123688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15467 (or 15463 counting only the distinct ones).

The product of its digits is 2304, while the sum is 28.

The square root of 123688 is about 351.6930479836. The cubic root of 123688 is about 49.8244510392.

The spelling of 123688 in words is "one hundred twenty-three thousand, six hundred eighty-eight".