13870399 has 4 divisors (see below), whose sum is σ = 14600440. Its totient is φ = 13140360.

The previous prime is 13870391. The next prime is 13870421. The reversal of 13870399 is 99307831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99307831 = 7 ⋅14186833.

It is a cyclic number.

It is not a de Polignac number, because 13870399 - 2³ = 13870391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13870391) 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, 364992 + ... + 365029.

It is an arithmetic number, because the mean of its divisors is an integer number (3650110).

Almost surely, 2^13870399 is an apocalyptic number.

13870399 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

13870399 is a deficient number, since it is larger than the sum of its proper divisors (730041).

13870399 is an equidigital number, since it uses as much as digits as its factorization.

13870399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730040.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 13870399 is about 3724.2984574279. The cubic root of 13870399 is about 240.2682128775.

The spelling of 13870399 in words is "thirteen million, eight hundred seventy thousand, three hundred ninety-nine".