18897028 has 12 divisors (see below), whose sum is σ = 33239052. Its totient is φ = 9400160.

The previous prime is 18897019. The next prime is 18897031. The reversal of 18897028 is 82079881.

It can be written as a sum of positive squares in 2 ways, for example, as 8191044 + 10705984 = 2862^2 + 3272^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11203 + ... + 12778.

It is an arithmetic number, because the mean of its divisors is an integer number (2769921).

Almost surely, 2^18897028 is an apocalyptic number.

It is an amenable number.

18897028 is a deficient number, since it is larger than the sum of its proper divisors (14342024).

18897028 is a wasteful number, since it uses less digits than its factorization.

18897028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24182 (or 24180 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 43.

The square root of 18897028 is about 4347.0711979447. The cubic root of 18897028 is about 266.3572376179.

The spelling of 18897028 in words is "eighteen million, eight hundred ninety-seven thousand, twenty-eight".