18438838 has 16 divisors (see below), whose sum is σ = 31214160. Its totient is φ = 8092000.

The previous prime is 18438821. The next prime is 18438841. The reversal of 18438838 is 83883481.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18438794 and 18438803.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13813 + ... + 15088.

It is an arithmetic number, because the mean of its divisors is an integer number (1950885).

Almost surely, 2^18438838 is an apocalyptic number.

18438838 is a deficient number, since it is larger than the sum of its proper divisors (12775322).

18438838 is a wasteful number, since it uses less digits than its factorization.

18438838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28943.

The product of its digits is 147456, while the sum is 43.

The square root of 18438838 is about 4294.0468092465. The cubic root of 18438838 is about 264.1868416404.

The spelling of 18438838 in words is "eighteen million, four hundred thirty-eight thousand, eight hundred thirty-eight".