313121240 has 32 divisors (see below), whose sum is σ = 713448000. Its totient is φ = 123661824.

The previous prime is 313121239. The next prime is 313121261. The reversal of 313121240 is 42121313.

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, 46385 + ... + 52704.

It is an arithmetic number, because the mean of its divisors is an integer number (22295250).

Almost surely, 2^313121240 is an apocalyptic number.

It is an amenable number.

313121240 is an abundant number, since it is smaller than the sum of its proper divisors (400326760).

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

313121240 is a wasteful number, since it uses less digits than its factorization.

313121240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99179 (or 99175 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 313121240 is about 17695.2321261972. The cubic root of 313121240 is about 679.0537877734.

Adding to 313121240 its reverse (42121313), we get a palindrome (355242553).

The spelling of 313121240 in words is "three hundred thirteen million, one hundred twenty-one thousand, two hundred forty".