18989854 has 24 divisors (see below), whose sum is σ = 32478840. Its totient is φ = 8300448.

The previous prime is 18989851. The next prime is 18989857. The reversal of 18989854 is 45898981.

It is an interprime number because it is at equal distance from previous prime (18989851) and next prime (18989857).

It is a super-2 number, since 2×18989854² = 721229109882632, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18989851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4944 + ... + 7900.

It is an arithmetic number, because the mean of its divisors is an integer number (1353285).

Almost surely, 2^18989854 is an apocalyptic number.

18989854 is a deficient number, since it is larger than the sum of its proper divisors (13488986).

18989854 is a wasteful number, since it uses less digits than its factorization.

18989854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3004 (or 2991 counting only the distinct ones).

The product of its digits is 829440, while the sum is 52.

The square root of 18989854 is about 4357.7349621105. The cubic root of 18989854 is about 266.7926588658.

The spelling of 18989854 in words is "eighteen million, nine hundred eighty-nine thousand, eight hundred fifty-four".