309397639397 has 32 divisors (see below), whose sum is σ = 408555083520. Its totient is φ = 226839674880.

The previous prime is 309397639337. The next prime is 309397639423. The reversal of 309397639397 is 793936793903.

It is not a de Polignac number, because 309397639397 - 2²⁴ = 309380862181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309397639337) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4585973 + ... + 4652949.

It is an arithmetic number, because the mean of its divisors is an integer number (12767346360).

Almost surely, 2^309397639397 is an apocalyptic number.

It is an amenable number.

309397639397 is a deficient number, since it is larger than the sum of its proper divisors (99157444123).

309397639397 is a wasteful number, since it uses less digits than its factorization.

309397639397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70541.

The product of its (nonzero) digits is 156243654, while the sum is 68.

The spelling of 309397639397 in words is "three hundred nine billion, three hundred ninety-seven million, six hundred thirty-nine thousand, three hundred ninety-seven".