18040501 has 4 divisors (see below), whose sum is σ = 18049900. Its totient is φ = 18031104.

The previous prime is 18040499. The next prime is 18040507. The reversal of 18040501 is 10504081.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 5267025 + 12773476 = 2295^2 + 3574^2 .

It is a cyclic number.

It is not a de Polignac number, because 18040501 - 2¹ = 18040499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18040507) 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, 666 + ... + 6043.

It is an arithmetic number, because the mean of its divisors is an integer number (4512475).

Almost surely, 2^18040501 is an apocalyptic number.

18040501 is the 1900-th centered decagonal number.

It is an amenable number.

18040501 is a deficient number, since it is larger than the sum of its proper divisors (9399).

18040501 is an equidigital number, since it uses as much as digits as its factorization.

18040501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9398.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 18040501 is about 4247.4110938312. The cubic root of 18040501 is about 262.2705526387.

Adding to 18040501 its reverse (10504081), we get a palindrome (28544582).

The spelling of 18040501 in words is "eighteen million, forty thousand, five hundred one".