18719194 has 24 divisors (see below), whose sum is σ = 31633812. Its totient is φ = 8257920.

The previous prime is 18719191. The next prime is 18719203. The reversal of 18719194 is 49191781.

It can be written as a sum of positive squares in 2 ways, for example, as 16200625 + 2518569 = 4025^2 + 1587^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18719191) 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, 13074 + ... + 14434.

Almost surely, 2^18719194 is an apocalyptic number.

18719194 is a deficient number, since it is larger than the sum of its proper divisors (12914618).

18719194 is a wasteful number, since it uses less digits than its factorization.

18719194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1422 (or 1399 counting only the distinct ones).

The product of its digits is 18144, while the sum is 40.

The square root of 18719194 is about 4326.5683861462. The cubic root of 18719194 is about 265.5190680526.

The spelling of 18719194 in words is "eighteen million, seven hundred nineteen thousand, one hundred ninety-four".