18319194 has 24 divisors (see below), whose sum is σ = 40060020. Its totient is φ = 6049728.

The previous prime is 18319193. The next prime is 18319199. The reversal of 18319194 is 49191381.

It can be written as a sum of positive squares in 2 ways, for example, as 15800625 + 2518569 = 3975^2 + 1587^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18319193) 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 in 11 ways as a sum of consecutive naturals, for example, 2707 + ... + 6630.

Almost surely, 2^18319194 is an apocalyptic number.

18319194 is an abundant number, since it is smaller than the sum of its proper divisors (21740826).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18319194 is a wasteful number, since it uses less digits than its factorization.

18319194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9454 (or 9451 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 18319194 is about 4280.0927560042. The cubic root of 18319194 is about 263.6141919667.

It can be divided in two parts, 1831 and 9194, that added together give a square (11025 = 105²).

The spelling of 18319194 in words is "eighteen million, three hundred nineteen thousand, one hundred ninety-four".