18040511 has 4 divisors (see below), whose sum is σ = 18380952. Its totient is φ = 17700072.

The previous prime is 18040507. The next prime is 18040513. The reversal of 18040511 is 11504081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11504081 = 2861 ⋅4021.

It is a cyclic number.

It is not a de Polignac number, because 18040511 - 2² = 18040507 is a prime.

It is a super-2 number, since 2×18040511² = 650920074282242, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18040513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170141 + ... + 170246.

It is an arithmetic number, because the mean of its divisors is an integer number (4595238).

Almost surely, 2^18040511 is an apocalyptic number.

18040511 is a deficient number, since it is larger than the sum of its proper divisors (340441).

18040511 is an equidigital number, since it uses as much as digits as its factorization.

18040511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340440.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 18040511 is about 4247.4122710187. The cubic root of 18040511 is about 262.2706010983.

Adding to 18040511 its reverse (11504081), we get a palindrome (29544592).

The spelling of 18040511 in words is "eighteen million, forty thousand, five hundred eleven".