309368865 has 24 divisors (see below), whose sum is σ = 535999680. Its totient is φ = 152303424.

The previous prime is 309368861. The next prime is 309368867. The reversal of 309368865 is 568863903.

It is not a de Polignac number, because 309368865 - 2² = 309368861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309368861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58485 + ... + 63554.

It is an arithmetic number, because the mean of its divisors is an integer number (22333320).

Almost surely, 2^309368865 is an apocalyptic number.

It is an amenable number.

309368865 is a deficient number, since it is larger than the sum of its proper divisors (226630815).

309368865 is a wasteful number, since it uses less digits than its factorization.

309368865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122073 (or 122060 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 48.

The square root of 309368865 is about 17588.8847002873. The cubic root of 309368865 is about 676.3303365779.

The spelling of 309368865 in words is "three hundred nine million, three hundred sixty-eight thousand, eight hundred sixty-five".