18805438 has 4 divisors (see below), whose sum is σ = 28208160. Its totient is φ = 9402718.

The previous prime is 18805403. The next prime is 18805441. The reversal of 18805438 is 83450881.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 18805397 and 18805406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4701358 + ... + 4701361.

It is an arithmetic number, because the mean of its divisors is an integer number (7052040).

Almost surely, 2^18805438 is an apocalyptic number.

18805438 is a deficient number, since it is larger than the sum of its proper divisors (9402722).

18805438 is an equidigital number, since it uses as much as digits as its factorization.

18805438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9402721.

The product of its (nonzero) digits is 30720, while the sum is 37.

The square root of 18805438 is about 4336.5237229837. The cubic root of 18805438 is about 265.9262142943.

The spelling of 18805438 in words is "eighteen million, eight hundred five thousand, four hundred thirty-eight".