31989814 has 4 divisors (see below), whose sum is σ = 47984724. Its totient is φ = 15994906.

The previous prime is 31989809. The next prime is 31989823. The reversal of 31989814 is 41898913.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 41898913 = 7 ⋅5985559.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7997452 + ... + 7997455.

It is an arithmetic number, because the mean of its divisors is an integer number (11996181).

Almost surely, 2^31989814 is an apocalyptic number.

31989814 is a deficient number, since it is larger than the sum of its proper divisors (15994910).

31989814 is a wasteful number, since it uses less digits than its factorization.

31989814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15994909.

The product of its digits is 62208, while the sum is 43.

The square root of 31989814 is about 5655.9538541258. The cubic root of 31989814 is about 317.4465208456.

Subtracting 31989814 from its reverse (41898913), we obtain a palindrome (9909099).

The spelling of 31989814 in words is "thirty-one million, nine hundred eighty-nine thousand, eight hundred fourteen".