31989970 has 8 divisors (see below), whose sum is σ = 57581964. Its totient is φ = 12795984.

The previous prime is 31989959. The next prime is 31989983. The reversal of 31989970 is 7998913.

It can be written as a sum of positive squares in 2 ways, for example, as 31933801 + 56169 = 5651^2 + 237^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 31989970.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1599489 + ... + 1599508.

Almost surely, 2^31989970 is an apocalyptic number.

31989970 is a deficient number, since it is larger than the sum of its proper divisors (25591994).

31989970 is a wasteful number, since it uses less digits than its factorization.

31989970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3199004.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 31989970 is about 5655.9676448862. The cubic root of 31989970 is about 317.4470368596.

The spelling of 31989970 in words is "thirty-one million, nine hundred eighty-nine thousand, nine hundred seventy".