31379840 has 32 divisors (see below), whose sum is σ = 75018960. Its totient is φ = 12551680.

The previous prime is 31379837. The next prime is 31379861. The reversal of 31379840 is 4897313.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 31379840.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23876 + ... + 25155.

Almost surely, 2^31379840 is an apocalyptic number.

It is an amenable number.

31379840 is an abundant number, since it is smaller than the sum of its proper divisors (43639120).

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

31379840 is an equidigital number, since it uses as much as digits as its factorization.

31379840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49050 (or 49038 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 31379840 is about 5601.7711484851. The cubic root of 31379840 is about 315.4158947606.

The spelling of 31379840 in words is "thirty-one million, three hundred seventy-nine thousand, eight hundred forty".