31311396 has 72 divisors (see below), whose sum is σ = 82162080. Its totient is φ = 10047744.

The previous prime is 31311391. The next prime is 31311407. The reversal of 31311396 is 69311313.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (31311391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 174835 + ... + 175013.

It is an arithmetic number, because the mean of its divisors is an integer number (1141140).

Almost surely, 2^31311396 is an apocalyptic number.

31311396 is a gapful number since it is divisible by the number (36) 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 31311396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41081040).

31311396 is an abundant number, since it is smaller than the sum of its proper divisors (50850684).

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

31311396 is a wasteful number, since it uses less digits than its factorization.

31311396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345 (or 340 counting only the distinct ones).

The product of its digits is 1458, while the sum is 27.

The square root of 31311396 is about 5595.6586743653. The cubic root of 31311396 is about 315.1864051658.

The spelling of 31311396 in words is "thirty-one million, three hundred eleven thousand, three hundred ninety-six".