18686144 has 14 divisors (see below), whose sum is σ = 37080444. Its totient is φ = 9343040.

The previous prime is 18686141. The next prime is 18686203. The reversal of 18686144 is 44168681.

It is a junction number, because it is equal to n+sod(n) for n = 18686098 and 18686107.

It is not an unprimeable number, because it can be changed into a prime (18686141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145922 + ... + 146049.

Almost surely, 2^18686144 is an apocalyptic number.

It is an amenable number.

18686144 is a deficient number, since it is larger than the sum of its proper divisors (18394300).

18686144 is an equidigital number, since it uses as much as digits as its factorization.

18686144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291983 (or 291973 counting only the distinct ones).

The product of its digits is 36864, while the sum is 38.

The square root of 18686144 is about 4322.7472745929. The cubic root of 18686144 is about 265.3627120544.

The spelling of 18686144 in words is "eighteen million, six hundred eighty-six thousand, one hundred forty-four".