309742872 has 32 divisors (see below), whose sum is σ = 787055280. Its totient is φ = 101554560.

The previous prime is 309742871. The next prime is 309742879. The reversal of 309742872 is 278247903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309742871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104323 + ... + 107250.

Almost surely, 2^309742872 is an apocalyptic number.

It is an amenable number.

309742872 is an abundant number, since it is smaller than the sum of its proper divisors (477312408).

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

309742872 is a wasteful number, since it uses less digits than its factorization.

309742872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211643 (or 211639 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 42.

The square root of 309742872 is about 17599.5134023643. The cubic root of 309742872 is about 676.6027734032.

The spelling of 309742872 in words is "three hundred nine million, seven hundred forty-two thousand, eight hundred seventy-two".