18989896 has 16 divisors (see below), whose sum is σ = 36834300. Its totient is φ = 9167424.

The previous prime is 18989879. The next prime is 18989897. The reversal of 18989896 is 69898981.

It can be written as a sum of positive squares in 2 ways, for example, as 17757796 + 1232100 = 4214^2 + 1110^2 .

It is a Harshad number since it is a multiple of its sum of digits (58).

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 18989896.

It is not an unprimeable number, because it can be changed into a prime (18989897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40695 + ... + 41158.

Almost surely, 2^18989896 is an apocalyptic number.

It is an amenable number.

18989896 is a deficient number, since it is larger than the sum of its proper divisors (17844404).

18989896 is a wasteful number, since it uses less digits than its factorization.

18989896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81888 (or 81884 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 58.

The square root of 18989896 is about 4357.7397811251. The cubic root of 18989896 is about 266.7928555547.

The spelling of 18989896 in words is "eighteen million, nine hundred eighty-nine thousand, eight hundred ninety-six".