18922989 has 16 divisors (see below), whose sum is σ = 27578880. Its totient is φ = 11489280.

The previous prime is 18922931. The next prime is 18923039. The reversal of 18922989 is 98922981.

It is not a de Polignac number, because 18922989 - 2⁷ = 18922861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18922909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4404 + ... + 7565.

It is an arithmetic number, because the mean of its divisors is an integer number (1723680).

Almost surely, 2^18922989 is an apocalyptic number.

It is an amenable number.

18922989 is a deficient number, since it is larger than the sum of its proper divisors (8655891).

18922989 is a wasteful number, since it uses less digits than its factorization.

18922989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12020.

The product of its digits is 186624, while the sum is 48.

The square root of 18922989 is about 4350.0562065334. The cubic root of 18922989 is about 266.4791568965.

The spelling of 18922989 in words is "eighteen million, nine hundred twenty-two thousand, nine hundred eighty-nine".