309531242 has 32 divisors (see below), whose sum is σ = 498558720. Its totient is φ = 143700480.

The previous prime is 309531221. The next prime is 309531247. The reversal of 309531242 is 242135903.

It is not an unprimeable number, because it can be changed into a prime (309531247) 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, 668303 + ... + 668765.

It is an arithmetic number, because the mean of its divisors is an integer number (15579960).

Almost surely, 2^309531242 is an apocalyptic number.

It is a pronic number, being equal to 17593×17594.

309531242 is a deficient number, since it is larger than the sum of its proper divisors (189027478).

309531242 is a wasteful number, since it uses less digits than its factorization.

309531242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 309531242 is about 17593.4999928951. The cubic root of 309531242 is about 676.4486433366.

The spelling of 309531242 in words is "three hundred nine million, five hundred thirty-one thousand, two hundred forty-two".