13872399 has 4 divisors (see below), whose sum is σ = 18496536. Its totient is φ = 9248264.

The previous prime is 13872361. The next prime is 13872403. The reversal of 13872399 is 99327831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13872399 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13872399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13872329) 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, 2312064 + ... + 2312069.

It is an arithmetic number, because the mean of its divisors is an integer number (4624134).

Almost surely, 2^13872399 is an apocalyptic number.

13872399 is a deficient number, since it is larger than the sum of its proper divisors (4624137).

13872399 is an equidigital number, since it uses as much as digits as its factorization.

13872399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4624136.

The product of its digits is 81648, while the sum is 42.

The square root of 13872399 is about 3724.5669546942. The cubic root of 13872399 is about 240.2797605706.

The spelling of 13872399 in words is "thirteen million, eight hundred seventy-two thousand, three hundred ninety-nine".