129800657 has 24 divisors (see below), whose sum is σ = 155328192. Its totient is φ = 108108000.

The previous prime is 129800653. The next prime is 129800669. The reversal of 129800657 is 756008921.

It is not a de Polignac number, because 129800657 - 2² = 129800653 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129800657.

It is not an unprimeable number, because it can be changed into a prime (129800651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 391982 + ... + 392312.

It is an arithmetic number, because the mean of its divisors is an integer number (6472008).

Almost surely, 2^129800657 is an apocalyptic number.

It is an amenable number.

129800657 is a deficient number, since it is larger than the sum of its proper divisors (25527535).

129800657 is a wasteful number, since it uses less digits than its factorization.

129800657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549 (or 542 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 129800657 is about 11393.0091284085. The cubic root of 129800657 is about 506.3206383777.

The spelling of 129800657 in words is "one hundred twenty-nine million, eight hundred thousand, six hundred fifty-seven".