317978940 has 24 divisors (see below), whose sum is σ = 890341200. Its totient is φ = 84794368.

The previous prime is 317978929. The next prime is 317978951. The reversal of 317978940 is 49879713.

It is an interprime number because it is at equal distance from previous prime (317978929) and next prime (317978951).

It is a super-2 number, since 2×317978940² = 202221212567047200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 317978940.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2649765 + ... + 2649884.

It is an arithmetic number, because the mean of its divisors is an integer number (37097550).

Almost surely, 2^317978940 is an apocalyptic number.

317978940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

317978940 is an abundant number, since it is smaller than the sum of its proper divisors (572362260).

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

317978940 is a wasteful number, since it uses less digits than its factorization.

317978940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5299661 (or 5299659 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 48.

The square root of 317978940 is about 17831.9639972719. The cubic root of 317978940 is about 682.5473514357.

The spelling of 317978940 in words is "three hundred seventeen million, nine hundred seventy-eight thousand, nine hundred forty".