18889904 has 40 divisors (see below), whose sum is σ = 41314320. Its totient is φ = 8288000.

The previous prime is 18889841. The next prime is 18889909. The reversal of 18889904 is 40998881.

It is not an unprimeable number, because it can be changed into a prime (18889909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3254 + ... + 6954.

It is an arithmetic number, because the mean of its divisors is an integer number (1032858).

Almost surely, 2^18889904 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 18889904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20657160).

18889904 is an abundant number, since it is smaller than the sum of its proper divisors (22424416).

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

18889904 is a wasteful number, since it uses less digits than its factorization.

18889904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3749 (or 3743 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 47.

The square root of 18889904 is about 4346.2517184351. The cubic root of 18889904 is about 266.3237620283.

The spelling of 18889904 in words is "eighteen million, eight hundred eighty-nine thousand, nine hundred four".