18164273 has 6 divisors (see below), whose sum is σ = 18988914. Its totient is φ = 17374016.

The previous prime is 18164261. The next prime is 18164281. The reversal of 18164273 is 37246181.

It can be written as a sum of positive squares in only one way, i.e., 15108769 + 3055504 = 3887^2 + 1748^2 .

It is not a de Polignac number, because 18164273 - 2⁴ = 18164257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18164173) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16640 + ... + 17697.

It is an arithmetic number, because the mean of its divisors is an integer number (3164819).

Almost surely, 2^18164273 is an apocalyptic number.

It is an amenable number.

18164273 is a deficient number, since it is larger than the sum of its proper divisors (824641).

18164273 is an equidigital number, since it uses as much as digits as its factorization.

18164273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34383 (or 34360 counting only the distinct ones).

The product of its digits is 8064, while the sum is 32.

The square root of 18164273 is about 4261.9564756107. The cubic root of 18164273 is about 262.8689801217.

The spelling of 18164273 in words is "eighteen million, one hundred sixty-four thousand, two hundred seventy-three".