129012504 has 16 divisors (see below), whose sum is σ = 322531320. Its totient is φ = 43004160.

The previous prime is 129012491. The next prime is 129012511. The reversal of 129012504 is 405210921.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 5375521 = 129012504 / (1 + 2 + 9 + 0 + 1 + 2 + 5 + 0 + 4).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2687737 + ... + 2687784.

Almost surely, 2^129012504 is an apocalyptic number.

It is an amenable number.

129012504 is an abundant number, since it is smaller than the sum of its proper divisors (193518816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129012504 is a wasteful number, since it uses less digits than its factorization.

129012504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5375530 (or 5375526 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 129012504 is about 11358.3671361688. The cubic root of 129012504 is about 505.2937597465.

The spelling of 129012504 in words is "one hundred twenty-nine million, twelve thousand, five hundred four".