18040569 has 4 divisors (see below), whose sum is σ = 24054096. Its totient is φ = 12027044.

The previous prime is 18040559. The next prime is 18040591. The reversal of 18040569 is 96504081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96504081 = 3 ⋅32168027.

It is a cyclic number.

It is not a de Polignac number, because 18040569 - 2¹⁶ = 17975033 is a prime.

It is a super-2 number, since 2×18040569² = 650924259687522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18040549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3006759 + ... + 3006764.

It is an arithmetic number, because the mean of its divisors is an integer number (6013524).

Almost surely, 2^18040569 is an apocalyptic number.

It is an amenable number.

18040569 is a deficient number, since it is larger than the sum of its proper divisors (6013527).

18040569 is an equidigital number, since it uses as much as digits as its factorization.

18040569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6013526.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 18040569 is about 4247.4190986998. The cubic root of 18040569 is about 262.2708821635.

The spelling of 18040569 in words is "eighteen million, forty thousand, five hundred sixty-nine".