129687957 has 48 divisors (see below), whose sum is σ = 223766400. Its totient is φ = 72309888.

The previous prime is 129687919. The next prime is 129687983. The reversal of 129687957 is 759786921.

It is not a de Polignac number, because 129687957 - 2⁷ = 129687829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129687907) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 132253 + ... + 133229.

It is an arithmetic number, because the mean of its divisors is an integer number (4661800).

Almost surely, 2^129687957 is an apocalyptic number.

It is an amenable number.

129687957 is a deficient number, since it is larger than the sum of its proper divisors (94078443).

129687957 is an equidigital number, since it uses as much as digits as its factorization.

129687957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1047 (or 1030 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 54.

The square root of 129687957 is about 11388.0620388194. The cubic root of 129687957 is about 506.1740575614.

It can be divided in two parts, 1296 and 87957, that added together give a triangular number (89253 = T₄₂₂).

The spelling of 129687957 in words is "one hundred twenty-nine million, six hundred eighty-seven thousand, nine hundred fifty-seven".