31440474 has 40 divisors (see below), whose sum is σ = 75874260. Its totient is φ = 9673344.

The previous prime is 31440467. The next prime is 31440527. The reversal of 31440474 is 47404413.

It can be written as a sum of positive squares in 2 ways, for example, as 31438449 + 2025 = 5607^2 + 45^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5359 + ... + 9570.

Almost surely, 2^31440474 is an apocalyptic number.

31440474 is an abundant number, since it is smaller than the sum of its proper divisors (44433786).

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

31440474 is a wasteful number, since it uses less digits than its factorization.

31440474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14956 (or 14947 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 27.

The square root of 31440474 is about 5607.1805749414. The cubic root of 31440474 is about 315.6189191914.

Adding to 31440474 its reverse (47404413), we get a palindrome (78844887).

The spelling of 31440474 in words is "thirty-one million, four hundred forty thousand, four hundred seventy-four".