129808157 has 4 divisors (see below), whose sum is σ = 129837600. Its totient is φ = 129778716.

The previous prime is 129808153. The next prime is 129808163. The reversal of 129808157 is 751808921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 129808157 - 2² = 129808153 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129808153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6623 + ... + 17420.

It is an arithmetic number, because the mean of its divisors is an integer number (32459400).

Almost surely, 2^129808157 is an apocalyptic number.

It is an amenable number.

129808157 is a deficient number, since it is larger than the sum of its proper divisors (29443).

129808157 is an equidigital number, since it uses as much as digits as its factorization.

129808157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29442.

The product of its (nonzero) digits is 40320, while the sum is 41.

The square root of 129808157 is about 11393.3382728681. The cubic root of 129808157 is about 506.3303900789.

The spelling of 129808157 in words is "one hundred twenty-nine million, eight hundred eight thousand, one hundred fifty-seven".