31657442 has 8 divisors (see below), whose sum is σ = 47549916. Its totient is φ = 15807472.

The previous prime is 31657421. The next prime is 31657447. The reversal of 31657442 is 24475613.

It can be written as a sum of positive squares in 2 ways, for example, as 31259281 + 398161 = 5591^2 + 631^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 31657399 and 31657408.

It is not an unprimeable number, because it can be changed into a prime (31657447) 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 3 ways as a sum of consecutive naturals, for example, 8693 + ... + 11784.

Almost surely, 2^31657442 is an apocalyptic number.

31657442 is a deficient number, since it is larger than the sum of its proper divisors (15892474).

31657442 is a wasteful number, since it uses less digits than its factorization.

31657442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21252.

The product of its digits is 20160, while the sum is 32.

The square root of 31657442 is about 5626.4946458697. The cubic root of 31657442 is about 316.3432751472.

The spelling of 31657442 in words is "thirty-one million, six hundred fifty-seven thousand, four hundred forty-two".