31386312 has 32 divisors (see below), whose sum is σ = 87184800. Its totient is φ = 10462032.

The previous prime is 31386287. The next prime is 31386319. The reversal of 31386312 is 21368313.

It is a happy number.

It is a super-2 number, since 2×31386312² = 1970201161922688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 (31386319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72438 + ... + 72869.

It is an arithmetic number, because the mean of its divisors is an integer number (2724525).

Almost surely, 2^31386312 is an apocalyptic number.

It is an amenable number.

31386312 is an abundant number, since it is smaller than the sum of its proper divisors (55798488).

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

31386312 is a wasteful number, since it uses less digits than its factorization.

31386312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145322 (or 145312 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 31386312 is about 5602.3487931402. The cubic root of 31386312 is about 315.4375778045.

The spelling of 31386312 in words is "thirty-one million, three hundred eighty-six thousand, three hundred twelve".