31379940 has 48 divisors (see below), whose sum is σ = 97628160. Its totient is φ = 8367840.

The previous prime is 31379939. The next prime is 31379947. The reversal of 31379940 is 4997313.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 31379895 and 31379904.

It is not an unprimeable number, because it can be changed into a prime (31379947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28516 + ... + 29595.

It is an arithmetic number, because the mean of its divisors is an integer number (2033920).

Almost surely, 2^31379940 is an apocalyptic number.

31379940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31379940 is an abundant number, since it is smaller than the sum of its proper divisors (66248220).

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

31379940 is a wasteful number, since it uses less digits than its factorization.

31379940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58129 (or 58121 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 31379940 is about 5601.7800742264. The cubic root of 31379940 is about 315.4162298118.

The spelling of 31379940 in words is "thirty-one million, three hundred seventy-nine thousand, nine hundred forty".