123129904 has 40 divisors (see below), whose sum is σ = 243412992. Its totient is φ = 60325440.

The previous prime is 123129901. The next prime is 123129907. The reversal of 123129904 is 409921321.

It is an interprime number because it is at equal distance from previous prime (123129901) and next prime (123129907).

It is not an unprimeable number, because it can be changed into a prime (123129901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 321297 + ... + 321679.

Almost surely, 2^123129904 is an apocalyptic number.

It is an amenable number.

123129904 is a deficient number, since it is larger than the sum of its proper divisors (120283088).

123129904 is a wasteful number, since it uses less digits than its factorization.

123129904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745 (or 739 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 123129904 is about 11096.3914855236. The cubic root of 123129904 is about 497.4939995741.

The spelling of 123129904 in words is "one hundred twenty-three million, one hundred twenty-nine thousand, nine hundred four".