18040265 has 4 divisors (see below), whose sum is σ = 21648324. Its totient is φ = 14432208.

The previous prime is 18040261. The next prime is 18040273. The reversal of 18040265 is 56204081.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9653449 + 8386816 = 3107^2 + 2896^2 .

It is a cyclic number.

It is not a de Polignac number, because 18040265 - 2² = 18040261 is a prime.

It is a super-2 number, since 2×18040265² = 650902322540450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18040261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1804022 + ... + 1804031.

It is an arithmetic number, because the mean of its divisors is an integer number (5412081).

Almost surely, 2^18040265 is an apocalyptic number.

It is an amenable number.

18040265 is a deficient number, since it is larger than the sum of its proper divisors (3608059).

18040265 is an equidigital number, since it uses as much as digits as its factorization.

18040265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3608058.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 18040265 is about 4247.3833121111. The cubic root of 18040265 is about 262.2694089875.

The spelling of 18040265 in words is "eighteen million, forty thousand, two hundred sixty-five".