18806489 has 12 divisors (see below), whose sum is σ = 20490876. Its totient is φ = 17252352.

The previous prime is 18806453. The next prime is 18806497. The reversal of 18806489 is 98460881.

18806489 = T₁₅₀ + T₁₅₁ + ... + T₄₈₇.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 1459264 + 17347225 = 1208^2 + 4165^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18806489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18806419) 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, 43217 + ... + 43649.

It is an arithmetic number, because the mean of its divisors is an integer number (1707573).

Almost surely, 2^18806489 is an apocalyptic number.

It is an amenable number.

18806489 is a deficient number, since it is larger than the sum of its proper divisors (1684387).

18806489 is a wasteful number, since it uses less digits than its factorization.

18806489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716 (or 703 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 44.

The square root of 18806489 is about 4336.6449013033. The cubic root of 18806489 is about 265.9311682380.

The spelling of 18806489 in words is "eighteen million, eight hundred six thousand, four hundred eighty-nine".