31396320 has 72 divisors (see below), whose sum is σ = 107144856. Its totient is φ = 8371968.

The previous prime is 31396307. The next prime is 31396333. The reversal of 31396320 is 2369313.

It is an interprime number because it is at equal distance from previous prime (31396307) and next prime (31396333).

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 9462 + ... + 12341.

It is an arithmetic number, because the mean of its divisors is an integer number (1488123).

Almost surely, 2^31396320 is an apocalyptic number.

31396320 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31396320 is an abundant number, since it is smaller than the sum of its proper divisors (75748536).

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

31396320 is a wasteful number, since it uses less digits than its factorization.

31396320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21824 (or 21813 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 27.

The square root of 31396320 is about 5603.2419187467. The cubic root of 31396320 is about 315.4711015882.

The spelling of 31396320 in words is "thirty-one million, three hundred ninety-six thousand, three hundred twenty".