18238805 has 8 divisors (see below), whose sum is σ = 23570232. Its totient is φ = 13468608.

The previous prime is 18238789. The next prime is 18238811. The reversal of 18238805 is 50883281.

It can be written as a sum of positive squares in 4 ways, for example, as 1779556 + 16459249 = 1334^2 + 4057^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18238805 - 2⁴ = 18238789 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140234 + ... + 140363.

It is an arithmetic number, because the mean of its divisors is an integer number (2946279).

Almost surely, 2^18238805 is an apocalyptic number.

It is an amenable number.

18238805 is a deficient number, since it is larger than the sum of its proper divisors (5331427).

18238805 is a wasteful number, since it uses less digits than its factorization.

18238805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280615.

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 18238805 is about 4270.6913960154. The cubic root of 18238805 is about 263.2280258664.

The spelling of 18238805 in words is "eighteen million, two hundred thirty-eight thousand, eight hundred five".