13879999 has 4 divisors (see below), whose sum is σ = 15862864. Its totient is φ = 11897136.

The previous prime is 13879997. The next prime is 13880023. The reversal of 13879999 is 99997831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99997831 = 277 ⋅361003.

It is a cyclic number.

It is not a de Polignac number, because 13879999 - 2¹ = 13879997 is a prime.

It is a Duffinian number.

13879999 is a modest number, since divided by 9999 gives 1387 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13879997) 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, 991422 + ... + 991435.

It is an arithmetic number, because the mean of its divisors is an integer number (3965716).

Almost surely, 2^13879999 is an apocalyptic number.

13879999 is a deficient number, since it is larger than the sum of its proper divisors (1982865).

13879999 is an equidigital number, since it uses as much as digits as its factorization.

13879999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1982864.

The product of its digits is 1102248, while the sum is 55.

The square root of 13879999 is about 3725.5870678324. The cubic root of 13879999 is about 240.3236316848.

It can be divided in two parts, 13879 and 999, that added together give a triangular number (14878 = T₁₇₂).

The spelling of 13879999 in words is "thirteen million, eight hundred seventy-nine thousand, nine hundred ninety-nine".