309972396 has 24 divisors (see below), whose sum is σ = 724792320. Its totient is φ = 103106512.

The previous prime is 309972349. The next prime is 309972413. The reversal of 309972396 is 693279903.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21216 + ... + 32711.

It is an arithmetic number, because the mean of its divisors is an integer number (30199680).

Almost surely, 2^309972396 is an apocalyptic number.

It is an amenable number.

309972396 is an abundant number, since it is smaller than the sum of its proper divisors (414819924).

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

309972396 is a wasteful number, since it uses less digits than its factorization.

309972396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54413 (or 54411 counting only the distinct ones).

The product of its (nonzero) digits is 551124, while the sum is 48.

The square root of 309972396 is about 17606.0329432840. The cubic root of 309972396 is about 676.7698563245.

The spelling of 309972396 in words is "three hundred nine million, nine hundred seventy-two thousand, three hundred ninety-six".