309225312 has 72 divisors (see below), whose sum is σ = 959311080. Its totient is φ = 93703680.

The previous prime is 309225307. The next prime is 309225331. The reversal of 309225312 is 213522903.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45637 + ... + 51972.

It is an arithmetic number, because the mean of its divisors is an integer number (13323765).

Almost surely, 2^309225312 is an apocalyptic number.

309225312 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

309225312 is an abundant number, since it is smaller than the sum of its proper divisors (650085768).

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

309225312 is a wasteful number, since it uses less digits than its factorization.

309225312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97636 (or 97625 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 309225312 is about 17584.8034393336. The cubic root of 309225312 is about 676.2257103741.

The spelling of 309225312 in words is "three hundred nine million, two hundred twenty-five thousand, three hundred twelve".