309979872 has 60 divisors (see below), whose sum is σ = 911649816. Its totient is φ = 103325760.

The previous prime is 309979867. The next prime is 309979903. The reversal of 309979872 is 278979903.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 57204 + ... + 62387.

Almost surely, 2^309979872 is an apocalyptic number.

309979872 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

309979872 is an abundant number, since it is smaller than the sum of its proper divisors (601669944).

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

309979872 is a wasteful number, since it uses less digits than its factorization.

309979872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119613 (or 119596 counting only the distinct ones).

The product of its (nonzero) digits is 1714608, while the sum is 54.

The square root of 309979872 is about 17606.2452555904. The cubic root of 309979872 is about 676.7752971216.

The spelling of 309979872 in words is "three hundred nine million, nine hundred seventy-nine thousand, eight hundred seventy-two".