13999659 has 4 divisors (see below), whose sum is σ = 18666216. Its totient is φ = 9333104.

The previous prime is 13999651. The next prime is 13999673. The reversal of 13999659 is 95699931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95699931 = 3 ⋅31899977.

It is a cyclic number.

It is not a de Polignac number, because 13999659 - 2³ = 13999651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13999651) 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, 2333274 + ... + 2333279.

It is an arithmetic number, because the mean of its divisors is an integer number (4666554).

Almost surely, 2^13999659 is an apocalyptic number.

13999659 is a deficient number, since it is larger than the sum of its proper divisors (4666557).

13999659 is an equidigital number, since it uses as much as digits as its factorization.

13999659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4666556.

The product of its digits is 590490, while the sum is 51.

The square root of 13999659 is about 3741.6118184547. The cubic root of 13999659 is about 241.0122695957.

The spelling of 13999659 in words is "thirteen million, nine hundred ninety-nine thousand, six hundred fifty-nine".