31078940 has 12 divisors (see below), whose sum is σ = 65265816. Its totient is φ = 12431568.

The previous prime is 31078933. The next prime is 31078961. The reversal of 31078940 is 4987013.

It is a junction number, because it is equal to n+sod(n) for n = 31078897 and 31078906.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 776954 + ... + 776993.

It is an arithmetic number, because the mean of its divisors is an integer number (5438818).

Almost surely, 2^31078940 is an apocalyptic number.

It is an amenable number.

31078940 is an abundant number, since it is smaller than the sum of its proper divisors (34186876).

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

31078940 is a wasteful number, since it uses less digits than its factorization.

31078940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1553956 (or 1553954 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 31078940 is about 5574.8488768755. The cubic root of 31078940 is about 314.4044850196.

The spelling of 31078940 in words is "thirty-one million, seventy-eight thousand, nine hundred forty".