31986873 has 16 divisors (see below), whose sum is σ = 47712000. Its totient is φ = 21178800.

The previous prime is 31986853. The next prime is 31986881. The reversal of 31986873 is 37868913.

It is a happy number.

It is not a de Polignac number, because 31986873 - 2⁵ = 31986841 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (31986803) 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, 48 + ... + 7998.

It is an arithmetic number, because the mean of its divisors is an integer number (2982000).

Almost surely, 2^31986873 is an apocalyptic number.

It is an amenable number.

31986873 is a deficient number, since it is larger than the sum of its proper divisors (15725127).

31986873 is a wasteful number, since it uses less digits than its factorization.

31986873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8109 (or 8103 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 31986873 is about 5655.6938566369. The cubic root of 31986873 is about 317.4367923444.

The spelling of 31986873 in words is "thirty-one million, nine hundred eighty-six thousand, eight hundred seventy-three".