18444001 has 2 divisors, whose sum is σ = 18444002. Its totient is φ = 18444000.

The previous prime is 18443993. The next prime is 18444007. The reversal of 18444001 is 10044481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14440000 + 4004001 = 3800^2 + 2001^2 .

It is a cyclic number.

It is not a de Polignac number, because 18444001 - 2³ = 18443993 is a prime.

It is not a weakly prime, because it can be changed into another prime (18444007) 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 as a sum of consecutive naturals, namely, 9222000 + 9222001.

It is an arithmetic number, because the mean of its divisors is an integer number (9222001).

Almost surely, 2^18444001 is an apocalyptic number.

It is an amenable number.

18444001 is a deficient number, since it is larger than the sum of its proper divisors (1).

18444001 is an equidigital number, since it uses as much as digits as its factorization.

18444001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 18444001 is about 4294.6479483189. The cubic root of 18444001 is about 264.2114973766.

Adding to 18444001 its reverse (10044481), we get a palindrome (28488482).

The spelling of 18444001 in words is "eighteen million, four hundred forty-four thousand, one".