18677889 has 12 divisors (see below), whose sum is σ = 27488916. Its totient is φ = 12216672.

The previous prime is 18677887. The next prime is 18677947. The reversal of 18677889 is 98877681.

It can be written as a sum of positive squares in 2 ways, for example, as 14745600 + 3932289 = 3840^2 + 1983^2 .

It is not a de Polignac number, because 18677889 - 2¹ = 18677887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18677887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19102 + ... + 20055.

It is an arithmetic number, because the mean of its divisors is an integer number (2290743).

Almost surely, 2^18677889 is an apocalyptic number.

It is an amenable number.

18677889 is a deficient number, since it is larger than the sum of its proper divisors (8811027).

18677889 is a wasteful number, since it uses less digits than its factorization.

18677889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39216 (or 39213 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 54.

The square root of 18677889 is about 4321.7923365197. The cubic root of 18677889 is about 265.3236297653.

The spelling of 18677889 in words is "eighteen million, six hundred seventy-seven thousand, eight hundred eighty-nine".