13991812 has 12 divisors (see below), whose sum is σ = 24512796. Its totient is φ = 6988160.

The previous prime is 13991807. The next prime is 13991821. The reversal of 13991812 is 21819931.

It can be written as a sum of positive squares in 2 ways, for example, as 6230016 + 7761796 = 2496^2 + 2786^2 .

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, 4512 + ... + 6952.

It is an arithmetic number, because the mean of its divisors is an integer number (2042733).

Almost surely, 2^13991812 is an apocalyptic number.

It is an amenable number.

13991812 is a deficient number, since it is larger than the sum of its proper divisors (10520984).

13991812 is a wasteful number, since it uses less digits than its factorization.

13991812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3878 (or 3876 counting only the distinct ones).

The product of its digits is 3888, while the sum is 34.

The square root of 13991812 is about 3740.5630592198. The cubic root of 13991812 is about 240.9672309572.

The spelling of 13991812 in words is "thirteen million, nine hundred ninety-one thousand, eight hundred twelve".