18993828 has 96 divisors (see below), whose sum is σ = 54964224. Its totient is φ = 4981248.

The previous prime is 18993827. The next prime is 18993833. The reversal of 18993828 is 82839981.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18993827) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66975 + ... + 67257.

It is an arithmetic number, because the mean of its divisors is an integer number (572544).

Almost surely, 2^18993828 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 18993828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27482112).

18993828 is an abundant number, since it is smaller than the sum of its proper divisors (35970396).

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

18993828 is a wasteful number, since it uses less digits than its factorization.

18993828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361 (or 359 counting only the distinct ones).

The product of its digits is 248832, while the sum is 48.

The square root of 18993828 is about 4358.1909090814. The cubic root of 18993828 is about 266.8112681027.

The spelling of 18993828 in words is "eighteen million, nine hundred ninety-three thousand, eight hundred twenty-eight".