31072986 has 24 divisors (see below), whose sum is σ = 76942944. Its totient is φ = 8877960.

The previous prime is 31072939. The next prime is 31073017. The reversal of 31072986 is 68927013.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31072986.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 123180 + ... + 123431.

It is an arithmetic number, because the mean of its divisors is an integer number (3205956).

Almost surely, 2^31072986 is an apocalyptic number.

31072986 is an abundant number, since it is smaller than the sum of its proper divisors (45869958).

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

31072986 is a wasteful number, since it uses less digits than its factorization.

31072986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246626 (or 246623 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 31072986 is about 5574.3148457905. The cubic root of 31072986 is about 314.3844062153.

Adding to 31072986 its reverse (68927013), we get a palindrome (99999999).

The spelling of 31072986 in words is "thirty-one million, seventy-two thousand, nine hundred eighty-six".