309943139 has 16 divisors (see below), whose sum is σ = 345102720. Its totient is φ = 275996160.

The previous prime is 309943121. The next prime is 309943169. The reversal of 309943139 is 931349903.

It is not a de Polignac number, because 309943139 - 2⁸ = 309942883 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 309943096 and 309943105.

It is not an unprimeable number, because it can be changed into a prime (309943169) 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, 141152 + ... + 143330.

It is an arithmetic number, because the mean of its divisors is an integer number (21568920).

Almost surely, 2^309943139 is an apocalyptic number.

309943139 is a deficient number, since it is larger than the sum of its proper divisors (35159581).

309943139 is a wasteful number, since it uses less digits than its factorization.

309943139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2450.

The product of its (nonzero) digits is 78732, while the sum is 41.

The square root of 309943139 is about 17605.2020437142. The cubic root of 309943139 is about 676.7485631610.

The spelling of 309943139 in words is "three hundred nine million, nine hundred forty-three thousand, one hundred thirty-nine".