309357042 has 32 divisors (see below), whose sum is σ = 627792000. Its totient is φ = 101616768.

The previous prime is 309356989. The next prime is 309357053. The reversal of 309357042 is 240753903.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 309356994 and 309357012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128958 + ... + 131334.

It is an arithmetic number, because the mean of its divisors is an integer number (19618500).

Almost surely, 2^309357042 is an apocalyptic number.

309357042 is an abundant number, since it is smaller than the sum of its proper divisors (318434958).

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

309357042 is a wasteful number, since it uses less digits than its factorization.

309357042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2690.

The product of its (nonzero) digits is 22680, while the sum is 33.

The square root of 309357042 is about 17588.5486041345. The cubic root of 309357042 is about 676.3217208052.

The spelling of 309357042 in words is "three hundred nine million, three hundred fifty-seven thousand, forty-two".