18199894 has 16 divisors (see below), whose sum is σ = 29191968. Its totient is φ = 8479872.

The previous prime is 18199889. The next prime is 18199919. The reversal of 18199894 is 49899181.

It is a super-2 number, since 2×18199894² = 662472283222472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 904 + ... + 6100.

It is an arithmetic number, because the mean of its divisors is an integer number (1824498).

Almost surely, 2^18199894 is an apocalyptic number.

18199894 is a deficient number, since it is larger than the sum of its proper divisors (10992074).

18199894 is a wasteful number, since it uses less digits than its factorization.

18199894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5319.

The product of its digits is 186624, while the sum is 49.

The square root of 18199894 is about 4266.1333781306. The cubic root of 18199894 is about 263.0407007615.

The spelling of 18199894 in words is "eighteen million, one hundred ninety-nine thousand, eight hundred ninety-four".