129957015 has 16 divisors (see below), whose sum is σ = 216972288. Its totient is φ = 66296736.

The previous prime is 129957013. The next prime is 129957029. The reversal of 129957015 is 510759921.

It is not a de Polignac number, because 129957015 - 2¹ = 129957013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129957013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187999 + ... + 188688.

It is an arithmetic number, because the mean of its divisors is an integer number (13560768).

Almost surely, 2^129957015 is an apocalyptic number.

129957015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

129957015 is a deficient number, since it is larger than the sum of its proper divisors (87015273).

129957015 is a wasteful number, since it uses less digits than its factorization.

129957015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376718.

The product of its (nonzero) digits is 28350, while the sum is 39.

The square root of 129957015 is about 11399.8690781956. The cubic root of 129957015 is about 506.5238615794.

The spelling of 129957015 in words is "one hundred twenty-nine million, nine hundred fifty-seven thousand, fifteen".