18986560 has 28 divisors (see below), whose sum is σ = 45212508. Its totient is φ = 7594496.

The previous prime is 18986533. The next prime is 18986573. The reversal of 18986560 is 6568981.

18986560 is nontrivially palindromic in base 11.

It can be written as a sum of positive squares in 2 ways, for example, as 7750656 + 11235904 = 2784^2 + 3352^2 .

It is a super-3 number, since 3×18986560³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29347 + ... + 29986.

Almost surely, 2^18986560 is an apocalyptic number.

18986560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18986560 is an abundant number, since it is smaller than the sum of its proper divisors (26225948).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18986560 is an equidigital number, since it uses as much as digits as its factorization.

18986560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59350 (or 59340 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 18986560 is about 4357.3569970798. The cubic root of 18986560 is about 266.7772319289. Note that the first 3 decimals are identical.

The spelling of 18986560 in words is "eighteen million, nine hundred eighty-six thousand, five hundred sixty".