18989841 has 16 divisors (see below), whose sum is σ = 27578880. Its totient is φ = 11552640.

The previous prime is 18989837. The next prime is 18989851. The reversal of 18989841 is 14898981.

It is not a de Polignac number, because 18989841 - 2² = 18989837 is a prime.

It is a super-2 number, since 2×18989841² = 721228122410562, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18989821) 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, 736 + ... + 6206.

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

Almost surely, 2^18989841 is an apocalyptic number.

It is an amenable number.

18989841 is a deficient number, since it is larger than the sum of its proper divisors (8589039).

18989841 is a wasteful number, since it uses less digits than its factorization.

18989841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5576.

The product of its digits is 165888, while the sum is 48.

The square root of 18989841 is about 4357.7334705096. The cubic root of 18989841 is about 266.7925979858.

The spelling of 18989841 in words is "eighteen million, nine hundred eighty-nine thousand, eight hundred forty-one".