18004417 has 2 divisors, whose sum is σ = 18004418. Its totient is φ = 18004416.

The previous prime is 18004379. The next prime is 18004463. The reversal of 18004417 is 71440081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16941456 + 1062961 = 4116^2 + 1031^2 .

It is a cyclic number.

It is not a de Polignac number, because 18004417 - 2¹⁵ = 17971649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18004391 and 18004400.

It is not a weakly prime, because it can be changed into another prime (18004477) by changing a digit.

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 as a sum of consecutive naturals, namely, 9002208 + 9002209.

It is an arithmetic number, because the mean of its divisors is an integer number (9002209).

Almost surely, 2^18004417 is an apocalyptic number.

It is an amenable number.

18004417 is a deficient number, since it is larger than the sum of its proper divisors (1).

18004417 is an equidigital number, since it uses as much as digits as its factorization.

18004417 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 18004417 is about 4243.1612036311. The cubic root of 18004417 is about 262.0955743616.

Adding to 18004417 its reverse (71440081), we get a palindrome (89444498).

The spelling of 18004417 in words is "eighteen million, four thousand, four hundred seventeen".