18804918 has 32 divisors (see below), whose sum is σ = 41617152. Its totient is φ = 5616800.

The previous prime is 18804913. The next prime is 18804943. The reversal of 18804918 is 81940881.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18804911) 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, 2680 + ... + 6692.

It is an arithmetic number, because the mean of its divisors is an integer number (1300536).

Almost surely, 2^18804918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18804918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20808576).

18804918 is an abundant number, since it is smaller than the sum of its proper divisors (22812234).

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

18804918 is a wasteful number, since it uses less digits than its factorization.

18804918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4100.

The product of its (nonzero) digits is 18432, while the sum is 39.

The square root of 18804918 is about 4336.4637667113. The cubic root of 18804918 is about 265.9237631787.

The spelling of 18804918 in words is "eighteen million, eight hundred four thousand, nine hundred eighteen".