31103940 has 96 divisors (see below), whose sum is σ = 100638720. Its totient is φ = 7030656.

The previous prime is 31103929. The next prime is 31103957. The reversal of 31103940 is 4930113.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42901 + ... + 43619.

It is an arithmetic number, because the mean of its divisors is an integer number (1048320).

Almost surely, 2^31103940 is an apocalyptic number.

31103940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31103940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50319360).

31103940 is an abundant number, since it is smaller than the sum of its proper divisors (69534780).

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

31103940 is a wasteful number, since it uses less digits than its factorization.

31103940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841 (or 839 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 31103940 is about 5577.0906393925. The cubic root of 31103940 is about 314.4887650872.

The spelling of 31103940 in words is "thirty-one million, one hundred three thousand, nine hundred forty".