129157520 has 40 divisors (see below), whose sum is σ = 304534080. Its totient is φ = 50933120.

The previous prime is 129157519. The next prime is 129157543. The reversal of 129157520 is 25751921.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5690 + ... + 17049.

It is an arithmetic number, because the mean of its divisors is an integer number (7613352).

Almost surely, 2^129157520 is an apocalyptic number.

129157520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129157520 is an abundant number, since it is smaller than the sum of its proper divisors (175376560).

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

129157520 is a wasteful number, since it uses less digits than its factorization.

129157520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22823 (or 22817 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 32.

The square root of 129157520 is about 11364.7490073472. The cubic root of 129157520 is about 505.4830133450.

The spelling of 129157520 in words is "one hundred twenty-nine million, one hundred fifty-seven thousand, five hundred twenty".