129312996 has 12 divisors (see below), whose sum is σ = 301730352. Its totient is φ = 43104328.

The previous prime is 129312991. The next prime is 129313007. The reversal of 129312996 is 699213921.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (129312991) 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, 5388030 + ... + 5388053.

It is an arithmetic number, because the mean of its divisors is an integer number (25144196).

Almost surely, 2^129312996 is an apocalyptic number.

It is an amenable number.

129312996 is an abundant number, since it is smaller than the sum of its proper divisors (172417356).

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

129312996 is a wasteful number, since it uses less digits than its factorization.

129312996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10776090 (or 10776088 counting only the distinct ones).

The product of its digits is 52488, while the sum is 42.

The square root of 129312996 is about 11371.5872243060. The cubic root of 129312996 is about 505.6857605101.

The spelling of 129312996 in words is "one hundred twenty-nine million, three hundred twelve thousand, nine hundred ninety-six".