309939056 has 80 divisors (see below), whose sum is σ = 709287936. Its totient is φ = 128452608.

The previous prime is 309939031. The next prime is 309939101. The reversal of 309939056 is 650939903.

It is a super-2 number, since 2×309939056² = 192124436868342272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 309938998 and 309939016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 510305 + ... + 510911.

Almost surely, 2^309939056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 309939056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (354643968).

309939056 is an abundant number, since it is smaller than the sum of its proper divisors (399348880).

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

309939056 is a wasteful number, since it uses less digits than its factorization.

309939056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766 (or 760 counting only the distinct ones).

The product of its (nonzero) digits is 196830, while the sum is 44.

The square root of 309939056 is about 17605.0860832885. The cubic root of 309939056 is about 676.7455914584.

The spelling of 309939056 in words is "three hundred nine million, nine hundred thirty-nine thousand, fifty-six".