309724146 has 12 divisors (see below), whose sum is σ = 671069022. Its totient is φ = 103241376.

The previous prime is 309724117. The next prime is 309724153. The reversal of 309724146 is 641427903.

It can be written as a sum of positive squares in only one way, i.e., 296218521 + 13505625 = 17211^2 + 3675^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 309724146.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8603431 + ... + 8603466.

Almost surely, 2^309724146 is an apocalyptic number.

309724146 is an abundant number, since it is smaller than the sum of its proper divisors (361344876).

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

309724146 is a wasteful number, since it uses less digits than its factorization.

309724146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17206905 (or 17206902 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 309724146 is about 17598.9813909783. The cubic root of 309724146 is about 676.5891380946.

The spelling of 309724146 in words is "three hundred nine million, seven hundred twenty-four thousand, one hundred forty-six".