18904806 has 16 divisors (see below), whose sum is σ = 42010800. Its totient is φ = 6301584.

The previous prime is 18904793. The next prime is 18904807. The reversal of 18904806 is 60840981.

It is a happy number.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18904807) 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, 174991 + ... + 175098.

It is an arithmetic number, because the mean of its divisors is an integer number (2625675).

Almost surely, 2^18904806 is an apocalyptic number.

18904806 is an abundant number, since it is smaller than the sum of its proper divisors (23105994).

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

18904806 is a wasteful number, since it uses less digits than its factorization.

18904806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350100 (or 350094 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 18904806 is about 4347.9657312357. The cubic root of 18904806 is about 266.3937767396.

The spelling of 18904806 in words is "eighteen million, nine hundred four thousand, eight hundred six".