31988074 has 4 divisors (see below), whose sum is σ = 47982114. Its totient is φ = 15994036.

The previous prime is 31988071. The next prime is 31988081. The reversal of 31988074 is 47088913.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47088913 = 43 ⋅1095091.

It can be written as a sum of positive squares in only one way, i.e., 20475625 + 11512449 = 4525^2 + 3393^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (31988071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7997017 + ... + 7997020.

Almost surely, 2^31988074 is an apocalyptic number.

31988074 is a deficient number, since it is larger than the sum of its proper divisors (15994040).

31988074 is a wasteful number, since it uses less digits than its factorization.

31988074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15994039.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 31988074 is about 5655.8000318257. The cubic root of 31988074 is about 317.4407651910.

The spelling of 31988074 in words is "thirty-one million, nine hundred eighty-eight thousand, seventy-four".