13991882 has 4 divisors (see below), whose sum is σ = 20987826. Its totient is φ = 6995940.

The previous prime is 13991869. The next prime is 13991897. The reversal of 13991882 is 28819931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28819931 = 7 ⋅4117133.

It can be written as a sum of positive squares in only one way, i.e., 13608721 + 383161 = 3689^2 + 619^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3497969 + ... + 3497972.

Almost surely, 2^13991882 is an apocalyptic number.

13991882 is a deficient number, since it is larger than the sum of its proper divisors (6995944).

13991882 is an equidigital number, since it uses as much as digits as its factorization.

13991882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6995943.

The product of its digits is 31104, while the sum is 41.

The square root of 13991882 is about 3740.5724160882. The cubic root of 13991882 is about 240.9676328036.

The spelling of 13991882 in words is "thirteen million, nine hundred ninety-one thousand, eight hundred eighty-two".