18540565 has 8 divisors (see below), whose sum is σ = 22292640. Its totient is φ = 14803152.

The previous prime is 18540539. The next prime is 18540581. The reversal of 18540565 is 56504581.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 18540565 - 2⁷ = 18540437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18540565.

It is a congruent number.

It is an unprimeable number.

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, 655 + ... + 6124.

It is an arithmetic number, because the mean of its divisors is an integer number (2786580).

Almost surely, 2^18540565 is an apocalyptic number.

It is an amenable number.

18540565 is a deficient number, since it is larger than the sum of its proper divisors (3752075).

18540565 is an equidigital number, since it uses as much as digits as its factorization.

18540565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7331.

The product of its (nonzero) digits is 24000, while the sum is 34.

The square root of 18540565 is about 4305.8756368479. The cubic root of 18540565 is about 264.6717901821.

The spelling of 18540565 in words is "eighteen million, five hundred forty thousand, five hundred sixty-five".