31465940 has 48 divisors (see below), whose sum is σ = 72624384. Its totient is φ = 11356800.

The previous prime is 31465891. The next prime is 31465979. The reversal of 31465940 is 4956413.

It is a junction number, because it is equal to n+sod(n) for n = 31465897 and 31465906.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34085 + ... + 34995.

It is an arithmetic number, because the mean of its divisors is an integer number (1513008).

Almost surely, 2^31465940 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 31465940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36312192).

31465940 is an abundant number, since it is smaller than the sum of its proper divisors (41158444).

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

31465940 is a wasteful number, since it uses less digits than its factorization.

31465940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1088 (or 1086 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 31465940 is about 5609.4509535248. The cubic root of 31465940 is about 315.7041106795.

The spelling of 31465940 in words is "thirty-one million, four hundred sixty-five thousand, nine hundred forty".