18018401 has 2 divisors, whose sum is σ = 18018402. Its totient is φ = 18018400.

The previous prime is 18018397. The next prime is 18018433. The reversal of 18018401 is 10481081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11566801 + 6451600 = 3401^2 + 2540^2 .

It is a cyclic number.

It is not a de Polignac number, because 18018401 - 2² = 18018397 is a prime.

It is not a weakly prime, because it can be changed into another prime (18018461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9009200 + 9009201.

It is an arithmetic number, because the mean of its divisors is an integer number (9009201).

Almost surely, 2^18018401 is an apocalyptic number.

It is an amenable number.

18018401 is a deficient number, since it is larger than the sum of its proper divisors (1).

18018401 is an equidigital number, since it uses as much as digits as its factorization.

18018401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 18018401 is about 4244.8087118267. The cubic root of 18018401 is about 262.1634131966.

Adding to 18018401 its reverse (10481081), we get a palindrome (28499482).

It can be divided in two parts, 180 and 18401, that added together give a palindrome (18581).

The spelling of 18018401 in words is "eighteen million, eighteen thousand, four hundred one".