18969828 has 72 divisors (see below), whose sum is σ = 48646080. Its totient is φ = 5745600.

The previous prime is 18969817. The next prime is 18969869. The reversal of 18969828 is 82896981.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 125553 + ... + 125703.

It is an arithmetic number, because the mean of its divisors is an integer number (675640).

Almost surely, 2^18969828 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18969828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24323040).

18969828 is an abundant number, since it is smaller than the sum of its proper divisors (29676252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18969828 is a wasteful number, since it uses less digits than its factorization.

18969828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225 (or 204 counting only the distinct ones).

The product of its digits is 497664, while the sum is 51.

The square root of 18969828 is about 4355.4366026841. The cubic root of 18969828 is about 266.6988426453.

The spelling of 18969828 in words is "eighteen million, nine hundred sixty-nine thousand, eight hundred twenty-eight".