13999638 has 32 divisors (see below), whose sum is σ = 28926720. Its totient is φ = 4514720.

The previous prime is 13999621. The next prime is 13999651. The reversal of 13999638 is 83699931.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24856 + ... + 25412.

It is an arithmetic number, because the mean of its divisors is an integer number (903960).

Almost surely, 2^13999638 is an apocalyptic number.

13999638 is an abundant number, since it is smaller than the sum of its proper divisors (14927082).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13999638 is a wasteful number, since it uses less digits than its factorization.

13999638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692.

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

The square root of 13999638 is about 3741.6090121764. The cubic root of 13999638 is about 241.0121490865.

The spelling of 13999638 in words is "thirteen million, nine hundred ninety-nine thousand, six hundred thirty-eight".