18997694 has 4 divisors (see below), whose sum is σ = 28496544. Its totient is φ = 9498846.

The previous prime is 18997679. The next prime is 18997703. The reversal of 18997694 is 49679981.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

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 as a sum of consecutive naturals, namely, 4749422 + ... + 4749425.

It is an arithmetic number, because the mean of its divisors is an integer number (7124136).

Almost surely, 2^18997694 is an apocalyptic number.

18997694 is a deficient number, since it is larger than the sum of its proper divisors (9498850).

18997694 is an equidigital number, since it uses as much as digits as its factorization.

18997694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9498849.

The product of its digits is 979776, while the sum is 53.

The square root of 18997694 is about 4358.6344191731. The cubic root of 18997694 is about 266.8293691123.

It can be divided in two parts, 18997 and 694, that added together give a palindrome (19691).

The spelling of 18997694 in words is "eighteen million, nine hundred ninety-seven thousand, six hundred ninety-four".