13990863 has 4 divisors (see below), whose sum is σ = 18654488. Its totient is φ = 9327240.

The previous prime is 13990861. The next prime is 13990871. The reversal of 13990863 is 36809931.

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

It is not a de Polignac number, because 13990863 - 2¹ = 13990861 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 (13990861) 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, 2331808 + ... + 2331813.

It is an arithmetic number, because the mean of its divisors is an integer number (4663622).

Almost surely, 2^13990863 is an apocalyptic number.

13990863 is a deficient number, since it is larger than the sum of its proper divisors (4663625).

13990863 is an equidigital number, since it uses as much as digits as its factorization.

13990863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4663624.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 13990863 is about 3740.4362045088. The cubic root of 13990863 is about 240.9617829358.

The spelling of 13990863 in words is "thirteen million, nine hundred ninety thousand, eight hundred sixty-three".