18939804 has 48 divisors (see below), whose sum is σ = 47943168. Its totient is φ = 5784768.

The previous prime is 18939803. The next prime is 18939841. The reversal of 18939804 is 40893981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18939803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25689 + ... + 26415.

It is an arithmetic number, because the mean of its divisors is an integer number (998816).

Almost surely, 2^18939804 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 18939804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23971584).

18939804 is an abundant number, since it is smaller than the sum of its proper divisors (29003364).

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

18939804 is a wasteful number, since it uses less digits than its factorization.

18939804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 914 (or 912 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 18939804 is about 4351.9885110142. The cubic root of 18939804 is about 266.5580648049.

It can be divided in two parts, 189 and 39804, that added together give a palindrome (39993).

The spelling of 18939804 in words is "eighteen million, nine hundred thirty-nine thousand, eight hundred four".