18494338 has 4 divisors (see below), whose sum is σ = 27741510. Its totient is φ = 9247168.

The previous prime is 18494303. The next prime is 18494347. The reversal of 18494338 is 83349481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83349481 = 97 ⋅859273.

It can be written as a sum of positive squares in only one way, i.e., 15421329 + 3073009 = 3927^2 + 1753^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 18494338.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4623583 + ... + 4623586.

Almost surely, 2^18494338 is an apocalyptic number.

18494338 is a deficient number, since it is larger than the sum of its proper divisors (9247172).

18494338 is an equidigital number, since it uses as much as digits as its factorization.

18494338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9247171.

The product of its digits is 82944, while the sum is 40.

The square root of 18494338 is about 4300.5043890223. The cubic root of 18494338 is about 264.4516392966.

The spelling of 18494338 in words is "eighteen million, four hundred ninety-four thousand, three hundred thirty-eight".