13668889 has 12 divisors (see below), whose sum is σ = 15317100. Its totient is φ = 12177984.

The previous prime is 13668881. The next prime is 13668911. The reversal of 13668889 is 98886631.

It can be written as a sum of positive squares in 6 ways, for example, as 1299600 + 12369289 = 1140^2 + 3517^2 .

It is not a de Polignac number, because 13668889 - 2³ = 13668881 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (13668881) 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, 3507 + ... + 6295.

It is an arithmetic number, because the mean of its divisors is an integer number (1276425).

Almost surely, 2^13668889 is an apocalyptic number.

It is an amenable number.

13668889 is a deficient number, since it is larger than the sum of its proper divisors (1648211).

13668889 is a wasteful number, since it uses less digits than its factorization.

13668889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2844 (or 2831 counting only the distinct ones).

The product of its digits is 497664, while the sum is 49.

The square root of 13668889 is about 3697.1460614912. The cubic root of 13668889 is about 239.0989885409.

The spelling of 13668889 in words is "thirteen million, six hundred sixty-eight thousand, eight hundred eighty-nine".