309039974 has 16 divisors (see below), whose sum is σ = 491606496. Its totient is φ = 145200000.

The previous prime is 309039967. The next prime is 309039977. The reversal of 309039974 is 479930903.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309039977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15599 + ... + 29349.

It is an arithmetic number, because the mean of its divisors is an integer number (30725406).

Almost surely, 2^309039974 is an apocalyptic number.

309039974 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

309039974 is a deficient number, since it is larger than the sum of its proper divisors (182566522).

309039974 is a wasteful number, since it uses less digits than its factorization.

309039974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14431.

The product of its (nonzero) digits is 183708, while the sum is 44.

The square root of 309039974 is about 17579.5328151803. The cubic root of 309039974 is about 676.0905819703.

It can be divided in two parts, 309039 and 974, that added together give a palindrome (310013).

The spelling of 309039974 in words is "three hundred nine million, thirty-nine thousand, nine hundred seventy-four".