18990885 has 8 divisors (see below), whose sum is σ = 30385440. Its totient is φ = 10128464.

The previous prime is 18990883. The next prime is 18990901. The reversal of 18990885 is 58809981.

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

It is a cyclic number.

It is not a de Polignac number, because 18990885 - 2¹ = 18990883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18990883) 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, 633015 + ... + 633044.

It is an arithmetic number, because the mean of its divisors is an integer number (3798180).

Almost surely, 2^18990885 is an apocalyptic number.

18990885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18990885 is a deficient number, since it is larger than the sum of its proper divisors (11394555).

18990885 is a wasteful number, since it uses less digits than its factorization.

18990885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1266067.

The product of its (nonzero) digits is 207360, while the sum is 48.

The square root of 18990885 is about 4357.8532559048. The cubic root of 18990885 is about 266.7974870274.

The spelling of 18990885 in words is "eighteen million, nine hundred ninety thousand, eight hundred eighty-five".