309942320 has 20 divisors (see below), whose sum is σ = 720616080. Its totient is φ = 123976896.

The previous prime is 309942293. The next prime is 309942337. The reversal of 309942320 is 23249903.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1937060 + ... + 1937219.

It is an arithmetic number, because the mean of its divisors is an integer number (36030804).

Almost surely, 2^309942320 is an apocalyptic number.

It is an amenable number.

309942320 is an abundant number, since it is smaller than the sum of its proper divisors (410673760).

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

309942320 is a wasteful number, since it uses less digits than its factorization.

309942320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3874292 (or 3874286 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 309942320 is about 17605.1787835284. The cubic root of 309942320 is about 676.7479670758.

The spelling of 309942320 in words is "three hundred nine million, nine hundred forty-two thousand, three hundred twenty".