31379380 has 12 divisors (see below), whose sum is σ = 65896740. Its totient is φ = 12551744.

The previous prime is 31379377. The next prime is 31379401. The reversal of 31379380 is 8397313.

It can be written as a sum of positive squares in 2 ways, for example, as 15586704 + 15792676 = 3948^2 + 3974^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 784465 + ... + 784504.

It is an arithmetic number, because the mean of its divisors is an integer number (5491395).

Almost surely, 2^31379380 is an apocalyptic number.

It is an amenable number.

31379380 is an abundant number, since it is smaller than the sum of its proper divisors (34517360).

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

31379380 is a wasteful number, since it uses less digits than its factorization.

31379380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1568978 (or 1568976 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 31379380 is about 5601.7300898919. The cubic root of 31379380 is about 315.4143535161.

The spelling of 31379380 in words is "thirty-one million, three hundred seventy-nine thousand, three hundred eighty".