31947985 has 8 divisors (see below), whose sum is σ = 38371176. Its totient is φ = 25536000.

The previous prime is 31947973. The next prime is 31947991. The reversal of 31947985 is 58974913.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 543169 + 31404816 = 737^2 + 5604^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31947985 - 2¹⁹ = 31423697 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5985 + ... + 9985.

It is an arithmetic number, because the mean of its divisors is an integer number (4796397).

Almost surely, 2^31947985 is an apocalyptic number.

It is an amenable number.

31947985 is a deficient number, since it is larger than the sum of its proper divisors (6423191).

31947985 is a wasteful number, since it uses less digits than its factorization.

31947985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5603.

The product of its digits is 272160, while the sum is 46.

The square root of 31947985 is about 5652.2548597883. The cubic root of 31947985 is about 317.3080990525.

The spelling of 31947985 in words is "thirty-one million, nine hundred forty-seven thousand, nine hundred eighty-five".