18997746 has 16 divisors (see below), whose sum is σ = 38121408. Its totient is φ = 6311600.

The previous prime is 18997733. The next prime is 18997757. The reversal of 18997746 is 64779981.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3225 + ... + 6956.

It is an arithmetic number, because the mean of its divisors is an integer number (2382588).

Almost surely, 2^18997746 is an apocalyptic number.

18997746 is an abundant number, since it is smaller than the sum of its proper divisors (19123662).

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

18997746 is a wasteful number, since it uses less digits than its factorization.

18997746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10497.

The product of its digits is 762048, while the sum is 51.

The square root of 18997746 is about 4358.6403843401. The cubic root of 18997746 is about 266.8296125649.

The spelling of 18997746 in words is "eighteen million, nine hundred ninety-seven thousand, seven hundred forty-six".