13991599 has 4 divisors (see below), whose sum is σ = 14053464. Its totient is φ = 13929736.

The previous prime is 13991597. The next prime is 13991639. The reversal of 13991599 is 99519931.

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 13991599 - 2¹ = 13991597 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 (13991591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30592 + ... + 31045.

It is an arithmetic number, because the mean of its divisors is an integer number (3513366).

Almost surely, 2^13991599 is an apocalyptic number.

13991599 is a deficient number, since it is larger than the sum of its proper divisors (61865).

13991599 is an equidigital number, since it uses as much as digits as its factorization.

13991599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61864.

The product of its digits is 98415, while the sum is 46.

The square root of 13991599 is about 3740.5345874621. The cubic root of 13991599 is about 240.9660081877.

The spelling of 13991599 in words is "thirteen million, nine hundred ninety-one thousand, five hundred ninety-nine".