18338738 has 16 divisors (see below), whose sum is σ = 30303936. Its totient is φ = 8253840.

The previous prime is 18338713. The next prime is 18338741. The reversal of 18338738 is 83783381.

It is a super-2 number, since 2×18338738² = 672618622865288, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18338695 and 18338704.

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, 1781 + ... + 6312.

It is an arithmetic number, because the mean of its divisors is an integer number (1893996).

Almost surely, 2^18338738 is an apocalyptic number.

18338738 is a deficient number, since it is larger than the sum of its proper divisors (11965198).

18338738 is a wasteful number, since it uses less digits than its factorization.

18338738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8209.

The product of its digits is 96768, while the sum is 41.

The square root of 18338738 is about 4282.3752754750. The cubic root of 18338738 is about 263.7079050539.

The spelling of 18338738 in words is "eighteen million, three hundred thirty-eight thousand, seven hundred thirty-eight".