18404011 has 4 divisors (see below), whose sum is σ = 18521392. Its totient is φ = 18286632.

The previous prime is 18403999. The next prime is 18404021. The reversal of 18404011 is 11040481.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18404011 - 2¹⁷ = 18272939 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18404011.

It is not an unprimeable number, because it can be changed into a prime (18404021) 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, 58455 + ... + 58768.

It is an arithmetic number, because the mean of its divisors is an integer number (4630348).

Almost surely, 2^18404011 is an apocalyptic number.

18404011 is a deficient number, since it is larger than the sum of its proper divisors (117381).

18404011 is a wasteful number, since it uses less digits than its factorization.

18404011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117380.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 18404011 is about 4289.9896270271. The cubic root of 18404011 is about 264.0204060979.

Adding to 18404011 its reverse (11040481), we get a palindrome (29444492).

The spelling of 18404011 in words is "eighteen million, four hundred four thousand, eleven".