308640426 has 8 divisors (see below), whose sum is σ = 617280864. Its totient is φ = 102880140.

The previous prime is 308640407. The next prime is 308640469. The reversal of 308640426 is 624046803.

308640426 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

308640426 is an admirable number.

It is a super-2 number, since 2×308640426² = 190517825122922952, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25720030 + ... + 25720041.

It is an arithmetic number, because the mean of its divisors is an integer number (77160108).

Almost surely, 2^308640426 is an apocalyptic number.

308640426 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

308640426 is a wasteful number, since it uses less digits than its factorization.

308640426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51440076.

The product of its (nonzero) digits is 27648, while the sum is 33.

The square root of 308640426 is about 17568.1651290054. The cubic root of 308640426 is about 675.7990909435.

The spelling of 308640426 in words is "three hundred eight million, six hundred forty thousand, four hundred twenty-six".