31239994 has 8 divisors (see below), whose sum is σ = 47131380. Its totient is φ = 15529536.

The previous prime is 31239977. The next prime is 31240019. The reversal of 31239994 is 49993213.

31239994 = 336² + 337² + ... + 508².

It can be written as a sum of positive squares in 2 ways, for example, as 21967969 + 9272025 = 4687^2 + 3045^2 .

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

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, 44799 + ... + 45490.

Almost surely, 2^31239994 is an apocalyptic number.

31239994 is a deficient number, since it is larger than the sum of its proper divisors (15891386).

31239994 is a wasteful number, since it uses less digits than its factorization.

31239994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90464.

The product of its digits is 52488, while the sum is 40.

The square root of 31239994 is about 5589.2749082506. The cubic root of 31239994 is about 314.9466408316.

The spelling of 31239994 in words is "thirty-one million, two hundred thirty-nine thousand, nine hundred ninety-four".