31679940 has 48 divisors (see below), whose sum is σ = 89066880. Its totient is φ = 8413440.

The previous prime is 31679939. The next prime is 31679941. The reversal of 31679940 is 4997613.

It is an interprime number because it is at equal distance from previous prime (31679939) and next prime (31679941).

It is not an unprimeable number, because it can be changed into a prime (31679941) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 15921 + ... + 17799.

It is an arithmetic number, because the mean of its divisors is an integer number (1855560).

Almost surely, 2^31679940 is an apocalyptic number.

31679940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31679940 is an abundant number, since it is smaller than the sum of its proper divisors (57386940).

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

31679940 is a wasteful number, since it uses less digits than its factorization.

31679940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2172 (or 2170 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 31679940 is about 5628.4935817677. The cubic root of 31679940 is about 316.4181959794.

The spelling of 31679940 in words is "thirty-one million, six hundred seventy-nine thousand, nine hundred forty".