18989877 has 8 divisors (see below), whose sum is σ = 25698016. Its totient is φ = 12470832.

The previous prime is 18989863. The next prime is 18989879. The reversal of 18989877 is 77898981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18989877 - 2¹² = 18985781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18989879) 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 7 ways as a sum of consecutive naturals, for example, 47038 + ... + 47439.

It is an arithmetic number, because the mean of its divisors is an integer number (3212252).

Almost surely, 2^18989877 is an apocalyptic number.

It is an amenable number.

18989877 is a deficient number, since it is larger than the sum of its proper divisors (6708139).

18989877 is an equidigital number, since it uses as much as digits as its factorization.

18989877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94547.

The product of its digits is 2032128, while the sum is 57.

The square root of 18989877 is about 4357.7376010953. The cubic root of 18989877 is about 266.7927665764.

The spelling of 18989877 in words is "eighteen million, nine hundred eighty-nine thousand, eight hundred seventy-seven".