13889409 has 4 divisors (see below), whose sum is σ = 18519216. Its totient is φ = 9259604.

The previous prime is 13889389. The next prime is 13889411. The reversal of 13889409 is 90498831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13889409 - 2⁵ = 13889377 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13889509) 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, 2314899 + ... + 2314904.

It is an arithmetic number, because the mean of its divisors is an integer number (4629804).

Almost surely, 2^13889409 is an apocalyptic number.

It is an amenable number.

13889409 is a deficient number, since it is larger than the sum of its proper divisors (4629807).

13889409 is an equidigital number, since it uses as much as digits as its factorization.

13889409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4629806.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 13889409 is about 3726.8497420744. The cubic root of 13889409 is about 240.3779288672.

The spelling of 13889409 in words is "thirteen million, eight hundred eighty-nine thousand, four hundred nine".