31947970 has 8 divisors (see below), whose sum is σ = 57506364. Its totient is φ = 12779184.

The previous prime is 31947961. The next prime is 31947973. The reversal of 31947970 is 7974913.

It can be written as a sum of positive squares in 2 ways, for example, as 29517489 + 2430481 = 5433^2 + 1559^2 .

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

It is not an unprimeable number, because it can be changed into a prime (31947973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1597389 + ... + 1597408.

Almost surely, 2^31947970 is an apocalyptic number.

31947970 is a deficient number, since it is larger than the sum of its proper divisors (25558394).

31947970 is a wasteful number, since it uses less digits than its factorization.

31947970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3194804.

The product of its (nonzero) digits is 47628, while the sum is 40.

The square root of 31947970 is about 5652.2535328840. The cubic root of 31947970 is about 317.3080493924.

The spelling of 31947970 in words is "thirty-one million, nine hundred forty-seven thousand, nine hundred seventy".