31242186 has 20 divisors (see below), whose sum is σ = 70006002. Its totient is φ = 10414008.

The previous prime is 31242179. The next prime is 31242191. The reversal of 31242186 is 68124213.

It can be written as a sum of positive squares in only one way, i.e., 23707161 + 7535025 = 4869^2 + 2745^2 .

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 9 ways as a sum of consecutive naturals, for example, 96265 + ... + 96588.

Almost surely, 2^31242186 is an apocalyptic number.

31242186 is an abundant number, since it is smaller than the sum of its proper divisors (38763816).

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

31242186 is a wasteful number, since it uses less digits than its factorization.

31242186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192867 (or 192858 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 31242186 is about 5589.4709946470. The cubic root of 31242186 is about 314.9540068903.

Adding to 31242186 its reverse (68124213), we get a palindrome (99366399).

The spelling of 31242186 in words is "thirty-one million, two hundred forty-two thousand, one hundred eighty-six".