31380912 has 80 divisors (see below), whose sum is σ = 95395680. Its totient is φ = 9842688.

The previous prime is 31380893. The next prime is 31380931. The reversal of 31380912 is 21908313.

It is an interprime number because it is at equal distance from previous prime (31380893) and next prime (31380931).

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5208 + ... + 9480.

It is an arithmetic number, because the mean of its divisors is an integer number (1192446).

Almost surely, 2^31380912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31380912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47697840).

31380912 is an abundant number, since it is smaller than the sum of its proper divisors (64014768).

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

31380912 is a wasteful number, since it uses less digits than its factorization.

31380912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4307 (or 4295 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 31380912 is about 5601.8668316910. The cubic root of 31380912 is about 315.4194864721.

It can be divided in two parts, 313 and 80912, that added together give a square (81225 = 285²).

The spelling of 31380912 in words is "thirty-one million, three hundred eighty thousand, nine hundred twelve".