18604394 has 4 divisors (see below), whose sum is σ = 27906594. Its totient is φ = 9302196.

The previous prime is 18604393. The next prime is 18604427. The reversal of 18604394 is 49340681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13786369 + 4818025 = 3713^2 + 2195^2 .

It is a super-2 number, since 2×18604394² = 692246952214472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18604393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4651097 + ... + 4651100.

Almost surely, 2^18604394 is an apocalyptic number.

18604394 is a deficient number, since it is larger than the sum of its proper divisors (9302200).

18604394 is an equidigital number, since it uses as much as digits as its factorization.

18604394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9302199.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 18604394 is about 4313.2811176644. The cubic root of 18604394 is about 264.9751679592.

The spelling of 18604394 in words is "eighteen million, six hundred four thousand, three hundred ninety-four".