13990865 has 8 divisors (see below), whose sum is σ = 19187520. Its totient is φ = 9593712.

The previous prime is 13990861. The next prime is 13990871. The reversal of 13990865 is 56809931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13990865 - 2² = 13990861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13990861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199835 + ... + 199904.

It is an arithmetic number, because the mean of its divisors is an integer number (2398440).

Almost surely, 2^13990865 is an apocalyptic number.

It is an amenable number.

13990865 is a deficient number, since it is larger than the sum of its proper divisors (5196655).

13990865 is an equidigital number, since it uses as much as digits as its factorization.

13990865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399751.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 13990865 is about 3740.4364718573. The cubic root of 13990865 is about 240.9617944177.

The spelling of 13990865 in words is "thirteen million, nine hundred ninety thousand, eight hundred sixty-five".