18997165 has 16 divisors (see below), whose sum is σ = 25401600. Its totient is φ = 13520320.

The previous prime is 18997151. The next prime is 18997171. The reversal of 18997165 is 56179981.

It is a happy number.

It is not a de Polignac number, because 18997165 - 2¹⁹ = 18472877 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1090 + ... + 6259.

It is an arithmetic number, because the mean of its divisors is an integer number (1587600).

Almost surely, 2^18997165 is an apocalyptic number.

It is an amenable number.

18997165 is a deficient number, since it is larger than the sum of its proper divisors (6404435).

18997165 is a wasteful number, since it uses less digits than its factorization.

18997165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7412.

The product of its digits is 136080, while the sum is 46.

The square root of 18997165 is about 4358.5737346063. The cubic root of 18997165 is about 266.8268924249.

It can be divided in two parts, 189971 and 65, that added together give a triangular number (190036 = T₆₁₆).

The spelling of 18997165 in words is "eighteen million, nine hundred ninety-seven thousand, one hundred sixty-five".