309704 has 8 divisors (see below), whose sum is σ = 580710. Its totient is φ = 154848.

The previous prime is 309677. The next prime is 309707. The reversal of 309704 is 407903.

It can be written as a sum of positive squares in only one way, i.e., 220900 + 88804 = 470^2 + 298^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 309704.

It is not an unprimeable number, because it can be changed into a prime (309707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19349 + ... + 19364.

2³⁰⁹⁷⁰⁴ is an apocalyptic number.

It is an amenable number.

309704 is a deficient number, since it is larger than the sum of its proper divisors (271006).

309704 is a wasteful number, since it uses less digits than its factorization.

309704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38719 (or 38715 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 309704 is about 556.5105569529. The cubic root of 309704 is about 67.6574468202.

The spelling of 309704 in words is "three hundred nine thousand, seven hundred four".