13986991 has 4 divisors (see below), whose sum is σ = 14031432. Its totient is φ = 13942552.

The previous prime is 13986977. The next prime is 13987007. The reversal of 13986991 is 19968931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13986991 - 2¹⁵ = 13954223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13986901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21745 + ... + 22378.

It is an arithmetic number, because the mean of its divisors is an integer number (3507858).

Almost surely, 2^13986991 is an apocalyptic number.

13986991 is a deficient number, since it is larger than the sum of its proper divisors (44441).

13986991 is an equidigital number, since it uses as much as digits as its factorization.

13986991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44440.

The product of its digits is 104976, while the sum is 46.

The square root of 13986991 is about 3739.9185820015. The cubic root of 13986991 is about 240.9395519958.

The spelling of 13986991 in words is "thirteen million, nine hundred eighty-six thousand, nine hundred ninety-one".