18941904 has 80 divisors (see below), whose sum is σ = 54907200. Its totient is φ = 6251904.

The previous prime is 18941873. The next prime is 18941921. The reversal of 18941904 is 40914981.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70282 + ... + 70550.

It is an arithmetic number, because the mean of its divisors is an integer number (686340).

Almost surely, 2^18941904 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 18941904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27453600).

18941904 is an abundant number, since it is smaller than the sum of its proper divisors (35965296).

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

18941904 is a wasteful number, since it uses less digits than its factorization.

18941904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449 (or 437 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 18941904 is about 4352.2297733461. The cubic root of 18941904 is about 266.5679162136.

The spelling of 18941904 in words is "eighteen million, nine hundred forty-one thousand, nine hundred four".