31188042 has 12 divisors (see below), whose sum is σ = 67574130. Its totient is φ = 10396008.

The previous prime is 31188041. The next prime is 31188067. The reversal of 31188042 is 24088113.

It can be written as a sum of positive squares in only one way, i.e., 25613721 + 5574321 = 5061^2 + 2361^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31187997 and 31188015.

It is not an unprimeable number, because it can be changed into a prime (31188041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 866317 + ... + 866352.

Almost surely, 2^31188042 is an apocalyptic number.

31188042 is an abundant number, since it is smaller than the sum of its proper divisors (36386088).

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

31188042 is a wasteful number, since it uses less digits than its factorization.

31188042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1732677 (or 1732674 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 31188042 is about 5584.6255022159. The cubic root of 31188042 is about 314.7719589125.

The spelling of 31188042 in words is "thirty-one million, one hundred eighty-eight thousand, forty-two".