309242472 has 64 divisors (see below), whose sum is σ = 963878400. Its totient is φ = 80322240.

The previous prime is 309242471. The next prime is 309242509. The reversal of 309242472 is 274242903.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (309242471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81822 + ... + 85517.

It is an arithmetic number, because the mean of its divisors is an integer number (15060600).

Almost surely, 2^309242472 is an apocalyptic number.

It is an amenable number.

309242472 is an abundant number, since it is smaller than the sum of its proper divisors (654635928).

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

309242472 is a wasteful number, since it uses less digits than its factorization.

309242472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167366 (or 167362 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 309242472 is about 17585.2913538559. The cubic root of 309242472 is about 676.2382188569.

The spelling of 309242472 in words is "three hundred nine million, two hundred forty-two thousand, four hundred seventy-two".