309733940 has 24 divisors (see below), whose sum is σ = 650775552. Its totient is φ = 123829920.

The previous prime is 309733933. The next prime is 309733943. The reversal of 309733940 is 49337903.

It is a super-2 number, since 2×309733940² = 191870227175847200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 309733894 and 309733903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309733943) 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 7 ways as a sum of consecutive naturals, for example, 65537 + ... + 70103.

It is an arithmetic number, because the mean of its divisors is an integer number (27115648).

Almost surely, 2^309733940 is an apocalyptic number.

It is an amenable number.

309733940 is an abundant number, since it is smaller than the sum of its proper divisors (341041612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

309733940 is a wasteful number, since it uses less digits than its factorization.

309733940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7967 (or 7965 counting only the distinct ones).

The product of its (nonzero) digits is 61236, while the sum is 38.

The square root of 309733940 is about 17599.2596435191. The cubic root of 309733940 is about 676.5962696494.

The spelling of 309733940 in words is "three hundred nine million, seven hundred thirty-three thousand, nine hundred forty".