309400479 has 24 divisors (see below), whose sum is σ = 471084432. Its totient is φ = 202875840.

The previous prime is 309400477. The next prime is 309400489. The reversal of 309400479 is 974004903.

It is not a de Polignac number, because 309400479 - 2¹ = 309400477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309400477) 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, 4387 + ... + 25259.

It is an arithmetic number, because the mean of its divisors is an integer number (19628518).

Almost surely, 2^309400479 is an apocalyptic number.

309400479 is a deficient number, since it is larger than the sum of its proper divisors (161683953).

309400479 is an equidigital number, since it uses as much as digits as its factorization.

309400479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20949 (or 20937 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 309400479 is about 17589.7833698997. The cubic root of 309400479 is about 676.3533735642.

The spelling of 309400479 in words is "three hundred nine million, four hundred thousand, four hundred seventy-nine".