18443394 has 12 divisors (see below), whose sum is σ = 39960726. Its totient is φ = 6147792.

The previous prime is 18443389. The next prime is 18443407. The reversal of 18443394 is 49334481.

It can be written as a sum of positive squares in only one way, i.e., 18378369 + 65025 = 4287^2 + 255^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 512299 + ... + 512334.

Almost surely, 2^18443394 is an apocalyptic number.

18443394 is an abundant number, since it is smaller than the sum of its proper divisors (21517332).

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

18443394 is a wasteful number, since it uses less digits than its factorization.

18443394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024641 (or 1024638 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 18443394 is about 4294.5772783826. The cubic root of 18443394 is about 264.2085989068.

The spelling of 18443394 in words is "eighteen million, four hundred forty-three thousand, three hundred ninety-four".