18841806 has 48 divisors (see below), whose sum is σ = 44163600. Its totient is φ = 5785344.

The previous prime is 18841789. The next prime is 18841819. The reversal of 18841806 is 60814881.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11910 + ... + 13398.

It is an arithmetic number, because the mean of its divisors is an integer number (920075).

Almost surely, 2^18841806 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18841806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22081800).

18841806 is an abundant number, since it is smaller than the sum of its proper divisors (25321794).

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

18841806 is a wasteful number, since it uses less digits than its factorization.

18841806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1553 (or 1550 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 18841806 is about 4340.7149180751. The cubic root of 18841806 is about 266.0975295781.

The spelling of 18841806 in words is "eighteen million, eight hundred forty-one thousand, eight hundred six".