31986797 has 16 divisors (see below), whose sum is σ = 34309440. Its totient is φ = 29766912.

The previous prime is 31986793. The next prime is 31986803. The reversal of 31986797 is 79768913.

It is not a de Polignac number, because 31986797 - 2² = 31986793 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31986793) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140798 + ... + 141024.

It is an arithmetic number, because the mean of its divisors is an integer number (2144340).

Almost surely, 2^31986797 is an apocalyptic number.

It is an amenable number.

31986797 is a deficient number, since it is larger than the sum of its proper divisors (2322643).

31986797 is a wasteful number, since it uses less digits than its factorization.

31986797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412.

The product of its digits is 571536, while the sum is 50.

The square root of 31986797 is about 5655.6871377402. The cubic root of 31986797 is about 317.4365409370.

The spelling of 31986797 in words is "thirty-one million, nine hundred eighty-six thousand, seven hundred ninety-seven".