308931428 has 12 divisors (see below), whose sum is σ = 582217020. Its totient is φ = 142583712.

The previous prime is 308931421. The next prime is 308931443. The reversal of 308931428 is 824139803.

It can be written as a sum of positive squares in 2 ways, for example, as 12334144 + 296597284 = 3512^2 + 17222^2 .

It is a super-2 number, since 2×308931428² = 190877254412238368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 308931391 and 308931400.

It is not an unprimeable number, because it can be changed into a prime (308931421) 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, 2970443 + ... + 2970546.

It is an arithmetic number, because the mean of its divisors is an integer number (48518085).

Almost surely, 2^308931428 is an apocalyptic number.

It is an amenable number.

308931428 is a deficient number, since it is larger than the sum of its proper divisors (273285592).

308931428 is a wasteful number, since it uses less digits than its factorization.

308931428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5941006 (or 5941004 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 308931428 is about 17576.4452606322. The cubic root of 308931428 is about 676.0114168911.

The spelling of 308931428 in words is "three hundred eight million, nine hundred thirty-one thousand, four hundred twenty-eight".