18199965 has 64 divisors (see below), whose sum is σ = 35481600. Its totient is φ = 7789824.

The previous prime is 18199963. The next prime is 18199999. The reversal of 18199965 is 56999181.

It is not a de Polignac number, because 18199965 - 2¹ = 18199963 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18199963) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 130866 + ... + 131004.

It is an arithmetic number, because the mean of its divisors is an integer number (554400).

Almost surely, 2^18199965 is an apocalyptic number.

18199965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18199965 is a deficient number, since it is larger than the sum of its proper divisors (17281635).

18199965 is a wasteful number, since it uses less digits than its factorization.

18199965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226.

The product of its digits is 174960, while the sum is 48.

The square root of 18199965 is about 4266.1416994751. The cubic root of 18199965 is about 263.0410428123.

The spelling of 18199965 in words is "eighteen million, one hundred ninety-nine thousand, nine hundred sixty-five".