313211988 has 48 divisors (see below), whose sum is σ = 813039360. Its totient is φ = 104274432.

The previous prime is 313211971. The next prime is 313211989. The reversal of 313211988 is 889112313.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313211989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130245 + ... + 132627.

It is an arithmetic number, because the mean of its divisors is an integer number (16938320).

Almost surely, 2^313211988 is an apocalyptic number.

It is an amenable number.

313211988 is an abundant number, since it is smaller than the sum of its proper divisors (499827372).

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

313211988 is a wasteful number, since it uses less digits than its factorization.

313211988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3613 (or 3605 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 313211988 is about 17697.7961339823. The cubic root of 313211988 is about 679.1193819833.

The spelling of 313211988 in words is "three hundred thirteen million, two hundred eleven thousand, nine hundred eighty-eight".