309863345 has 16 divisors (see below), whose sum is σ = 416605248. Its totient is φ = 219263040.

The previous prime is 309863341. The next prime is 309863357. The reversal of 309863345 is 543368903.

It is not a de Polignac number, because 309863345 - 2² = 309863341 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (309863341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74099 + ... + 78168.

It is an arithmetic number, because the mean of its divisors is an integer number (26037828).

Almost surely, 2^309863345 is an apocalyptic number.

It is an amenable number.

309863345 is a deficient number, since it is larger than the sum of its proper divisors (106741903).

309863345 is a wasteful number, since it uses less digits than its factorization.

309863345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152320.

The product of its (nonzero) digits is 233280, while the sum is 41.

The square root of 309863345 is about 17602.9356926622. The cubic root of 309863345 is about 676.6904824974.

The spelling of 309863345 in words is "three hundred nine million, eight hundred sixty-three thousand, three hundred forty-five".