13888889 has 12 divisors (see below), whose sum is σ = 16115904. Its totient is φ = 11724912.

The previous prime is 13888879. The next prime is 13888933. The reversal of 13888889 is 98888831.

It is not a de Polignac number, because 13888889 - 2²⁰ = 12840313 is a prime.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 13888889.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13888879) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83084 + ... + 83250.

It is an arithmetic number, because the mean of its divisors is an integer number (1342992).

Almost surely, 2^13888889 is an apocalyptic number.

It is an amenable number.

13888889 is a deficient number, since it is larger than the sum of its proper divisors (2227015).

13888889 is an equidigital number, since it uses as much as digits as its factorization.

13888889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392 (or 283 counting only the distinct ones).

The product of its digits is 884736, while the sum is 53.

The square root of 13888889 is about 3726.7799774068. The cubic root of 13888889 is about 240.3749290256.

The spelling of 13888889 in words is "thirteen million, eight hundred eighty-eight thousand, eight hundred eighty-nine".