13639899 has 32 divisors (see below), whose sum is σ = 23708160. Its totient is φ = 6769152.

The previous prime is 13639867. The next prime is 13639919. The reversal of 13639899 is 99893631.

It is a happy number.

It is not a de Polignac number, because 13639899 - 2⁵ = 13639867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13639819) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3172 + ... + 6110.

It is an arithmetic number, because the mean of its divisors is an integer number (740880).

Almost surely, 2^13639899 is an apocalyptic number.

13639899 is a deficient number, since it is larger than the sum of its proper divisors (10068261).

13639899 is a wasteful number, since it uses less digits than its factorization.

13639899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2979.

The product of its digits is 314928, while the sum is 48.

The square root of 13639899 is about 3693.2233888569. The cubic root of 13639899 is about 238.9298359071.

The spelling of 13639899 in words is "thirteen million, six hundred thirty-nine thousand, eight hundred ninety-nine".