309945479 has 8 divisors (see below), whose sum is σ = 330382800. Its totient is φ = 289753216.

The previous prime is 309945451. The next prime is 309945497. The reversal of 309945479 is 974549903.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-309945479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309945379) 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, 58649 + ... + 63714.

It is an arithmetic number, because the mean of its divisors is an integer number (41297850).

Almost surely, 2^309945479 is an apocalyptic number.

309945479 is a deficient number, since it is larger than the sum of its proper divisors (20437321).

309945479 is a wasteful number, since it uses less digits than its factorization.

309945479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122529.

The product of its (nonzero) digits is 1224720, while the sum is 50.

The square root of 309945479 is about 17605.2685012186. The cubic root of 309945479 is about 676.7502662558.

The spelling of 309945479 in words is "three hundred nine million, nine hundred forty-five thousand, four hundred seventy-nine".