18197894 has 16 divisors (see below), whose sum is σ = 32069520. Its totient is φ = 7635360.

The previous prime is 18197869. The next prime is 18197911. The reversal of 18197894 is 49879181.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31529 + ... + 32100.

It is an arithmetic number, because the mean of its divisors is an integer number (2004345).

Almost surely, 2^18197894 is an apocalyptic number.

18197894 is a deficient number, since it is larger than the sum of its proper divisors (13871626).

18197894 is a wasteful number, since it uses less digits than its factorization.

18197894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63655.

The product of its digits is 145152, while the sum is 47.

The square root of 18197894 is about 4265.8989673925. The cubic root of 18197894 is about 263.0310651619.

It can be divided in two parts, 18197 and 894, that added together give a palindrome (19091).

The spelling of 18197894 in words is "eighteen million, one hundred ninety-seven thousand, eight hundred ninety-four".