13639999 has 4 divisors (see below), whose sum is σ = 13650336. Its totient is φ = 13629664.

The previous prime is 13639993. The next prime is 13640009. The reversal of 13639999 is 99993631.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 13639999 - 2¹⁷ = 13508927 is a prime.

It is a Duffinian number.

13639999 is a modest number, since divided by 9999 gives 1363 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13639993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2839 + ... + 5944.

It is an arithmetic number, because the mean of its divisors is an integer number (3412584).

Almost surely, 2^13639999 is an apocalyptic number.

13639999 is a deficient number, since it is larger than the sum of its proper divisors (10337).

13639999 is an equidigital number, since it uses as much as digits as its factorization.

13639999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10336.

The product of its digits is 354294, while the sum is 49.

The square root of 13639999 is about 3693.2369271413. The cubic root of 13639999 is about 238.9304198050.

The spelling of 13639999 in words is "thirteen million, six hundred thirty-nine thousand, nine hundred ninety-nine".