18504394 has 8 divisors (see below), whose sum is σ = 27876420. Its totient is φ = 9212256.

The previous prime is 18504391. The next prime is 18504419. The reversal of 18504394 is 49340581.

It can be written as a sum of positive squares in 2 ways, for example, as 18378369 + 126025 = 4287^2 + 355^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (18504391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19389 + ... + 20320.

Almost surely, 2^18504394 is an apocalyptic number.

18504394 is a deficient number, since it is larger than the sum of its proper divisors (9372026).

18504394 is a wasteful number, since it uses less digits than its factorization.

18504394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39944.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 18504394 is about 4301.6733953195. The cubic root of 18504394 is about 264.4995610595.

The spelling of 18504394 in words is "eighteen million, five hundred four thousand, three hundred ninety-four".