31707940 has 48 divisors (see below), whose sum is σ = 73410624. Its totient is φ = 11408000.

The previous prime is 31707919. The next prime is 31707943. The reversal of 31707940 is 4970713.

It is not an unprimeable number, because it can be changed into a prime (31707943) 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, 21507 + ... + 22933.

It is an arithmetic number, because the mean of its divisors is an integer number (1529388).

Almost surely, 2^31707940 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31707940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36705312).

31707940 is an abundant number, since it is smaller than the sum of its proper divisors (41702684).

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

31707940 is a wasteful number, since it uses less digits than its factorization.

31707940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1548 (or 1546 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 31707940 is about 5630.9803764531. The cubic root of 31707940 is about 316.5113895543.

The spelling of 31707940 in words is "thirty-one million, seven hundred seven thousand, nine hundred forty".