18919694 has 8 divisors (see below), whose sum is σ = 28488240. Its totient is φ = 9423616.

The previous prime is 18919673. The next prime is 18919697. The reversal of 18919694 is 49691981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18919697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17459 + ... + 18510.

It is an arithmetic number, because the mean of its divisors is an integer number (3561030).

Almost surely, 2^18919694 is an apocalyptic number.

18919694 is a deficient number, since it is larger than the sum of its proper divisors (9568546).

18919694 is a wasteful number, since it uses less digits than its factorization.

18919694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36234.

The product of its digits is 139968, while the sum is 47.

The square root of 18919694 is about 4349.6774593066. The cubic root of 18919694 is about 266.4636889421.

The spelling of 18919694 in words is "eighteen million, nine hundred nineteen thousand, six hundred ninety-four".