308931868 has 60 divisors (see below), whose sum is σ = 664285160. Its totient is φ = 125356896.

The previous prime is 308931829. The next prime is 308931869. The reversal of 308931868 is 868139803.

308931868 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (308931869) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 181630 + ... + 183322.

Almost surely, 2^308931868 is an apocalyptic number.

308931868 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 308931868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (332142580).

308931868 is an abundant number, since it is smaller than the sum of its proper divisors (355353292).

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

308931868 is a wasteful number, since it uses less digits than its factorization.

308931868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1744 (or 1721 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 308931868 is about 17576.4577773794. The cubic root of 308931868 is about 676.0117378306.

It can be divided in two parts, 30893 and 1868, that added together give a square (32761 = 181²).

The spelling of 308931868 in words is "three hundred eight million, nine hundred thirty-one thousand, eight hundred sixty-eight".