309383644 has 12 divisors (see below), whose sum is σ = 541770768. Its totient is φ = 154592000.

The previous prime is 309383639. The next prime is 309383647. The reversal of 309383644 is 446383903.

It is a junction number, because it is equal to n+sod(n) for n = 309383597 and 309383606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309383647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17752 + ... + 30559.

It is an arithmetic number, because the mean of its divisors is an integer number (45147564).

Almost surely, 2^309383644 is an apocalyptic number.

It is an amenable number.

309383644 is a deficient number, since it is larger than the sum of its proper divisors (232387124).

309383644 is a wasteful number, since it uses less digits than its factorization.

309383644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49916 (or 49914 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 40.

The square root of 309383644 is about 17589.3048185538. The cubic root of 309383644 is about 676.3411061672.

The spelling of 309383644 in words is "three hundred nine million, three hundred eighty-three thousand, six hundred forty-four".