31097940 has 24 divisors (see below), whose sum is σ = 87074400. Its totient is φ = 8292768.

The previous prime is 31097933. The next prime is 31097953. The reversal of 31097940 is 4979013.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259090 + ... + 259209.

It is an arithmetic number, because the mean of its divisors is an integer number (3628100).

Almost surely, 2^31097940 is an apocalyptic number.

31097940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31097940 is an abundant number, since it is smaller than the sum of its proper divisors (55976460).

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

31097940 is a wasteful number, since it uses less digits than its factorization.

31097940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518311 (or 518309 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 31097940 is about 5576.5526985764. The cubic root of 31097940 is about 314.4685419908.

The spelling of 31097940 in words is "thirty-one million, ninety-seven thousand, nine hundred forty".