18989960 has 32 divisors (see below), whose sum is σ = 46612800. Its totient is φ = 6905280.

The previous prime is 18989959. The next prime is 18990017. The reversal of 18989960 is 6998981.

It is a junction number, because it is equal to n+sod(n) for n = 18989899 and 18989908.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21140 + ... + 22019.

It is an arithmetic number, because the mean of its divisors is an integer number (1456650).

Almost surely, 2^18989960 is an apocalyptic number.

18989960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18989960 is an abundant number, since it is smaller than the sum of its proper divisors (27622840).

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

18989960 is a wasteful number, since it uses less digits than its factorization.

18989960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43181 (or 43177 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 50.

The square root of 18989960 is about 4357.7471243752. The cubic root of 18989960 is about 266.7931552707.

The spelling of 18989960 in words is "eighteen million, nine hundred eighty-nine thousand, nine hundred sixty".