18445806 has 40 divisors (see below), whose sum is σ = 42677184. Its totient is φ = 5948640.

The previous prime is 18445733. The next prime is 18445807. The reversal of 18445806 is 60854481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18445807) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3186 + ... + 6858.

Almost surely, 2^18445806 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18445806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21338592).

18445806 is an abundant number, since it is smaller than the sum of its proper divisors (24231378).

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

18445806 is a wasteful number, since it uses less digits than its factorization.

18445806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3718 (or 3709 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 18445806 is about 4294.8580884588. The cubic root of 18445806 is about 264.2201160090.

The spelling of 18445806 in words is "eighteen million, four hundred forty-five thousand, eight hundred six".