18540065 has 8 divisors (see below), whose sum is σ = 22468968. Its totient is φ = 14684800.

The previous prime is 18540061. The next prime is 18540083. The reversal of 18540065 is 56004581.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9784384 + 8755681 = 3128^2 + 2959^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18540065 - 2² = 18540061 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18540061) 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 7 ways as a sum of consecutive naturals, for example, 17852 + ... + 18861.

It is an arithmetic number, because the mean of its divisors is an integer number (2808621).

Almost surely, 2^18540065 is an apocalyptic number.

It is an amenable number.

18540065 is a deficient number, since it is larger than the sum of its proper divisors (3928903).

18540065 is a wasteful number, since it uses less digits than its factorization.

18540065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36819.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 18540065 is about 4305.8175762566. The cubic root of 18540065 is about 264.6694109471.

The spelling of 18540065 in words is "eighteen million, five hundred forty thousand, sixty-five".