18718338 has 32 divisors (see below), whose sum is σ = 38390400. Its totient is φ = 6082560.

The previous prime is 18718321. The next prime is 18718351. The reversal of 18718338 is 83381781.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18718296 and 18718305.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72706 + ... + 72962.

It is an arithmetic number, because the mean of its divisors is an integer number (1199700).

Almost surely, 2^18718338 is an apocalyptic number.

18718338 is an abundant number, since it is smaller than the sum of its proper divisors (19672062).

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

18718338 is a wasteful number, since it uses less digits than its factorization.

18718338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522.

The product of its digits is 32256, while the sum is 39.

The square root of 18718338 is about 4326.4694613507. The cubic root of 18718338 is about 265.5150207312.

The spelling of 18718338 in words is "eighteen million, seven hundred eighteen thousand, three hundred thirty-eight".