11918889 has 12 divisors (see below), whose sum is σ = 17286516. Its totient is φ = 7913472.

The previous prime is 11918867. The next prime is 11918891. The reversal of 11918889 is 98881911.

It can be written as a sum of positive squares in 2 ways, for example, as 10208025 + 1710864 = 3195^2 + 1308^2 .

It is not a de Polignac number, because 11918889 - 2⁸ = 11918633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11918839) 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, 264 + ... + 4889.

It is an arithmetic number, because the mean of its divisors is an integer number (1440543).

Almost surely, 2^11918889 is an apocalyptic number.

It is an amenable number.

11918889 is a deficient number, since it is larger than the sum of its proper divisors (5367627).

11918889 is a wasteful number, since it uses less digits than its factorization.

11918889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5416 (or 5413 counting only the distinct ones).

The product of its digits is 41472, while the sum is 45.

The square root of 11918889 is about 3452.3744003222. The cubic root of 11918889 is about 228.4258546085.

The spelling of 11918889 in words is "eleven million, nine hundred eighteen thousand, eight hundred eighty-nine".