31072940 has 48 divisors (see below), whose sum is σ = 70308000. Its totient is φ = 11492352.

The previous prime is 31072939. The next prime is 31073017. The reversal of 31072940 is 4927013.

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, 19286 + ... + 20834.

It is an arithmetic number, because the mean of its divisors is an integer number (1464750).

Almost surely, 2^31072940 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 31072940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35154000).

31072940 is an abundant number, since it is smaller than the sum of its proper divisors (39235060).

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

31072940 is a wasteful number, since it uses less digits than its factorization.

31072940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1634 (or 1632 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 31072940 is about 5574.3107197213. The cubic root of 31072940 is about 314.3842510785.

Adding to 31072940 its reverse (4927013), we get a palindrome (35999953).

The spelling of 31072940 in words is "thirty-one million, seventy-two thousand, nine hundred forty".