18522401 has 12 divisors (see below), whose sum is σ = 20013732. Its totient is φ = 17082624.

The previous prime is 18522377. The next prime is 18522421. The reversal of 18522401 is 10422581.

It can be written as a sum of positive squares in 2 ways, for example, as 5569600 + 12952801 = 2360^2 + 3599^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18522401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18522421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59021 + ... + 59333.

It is an arithmetic number, because the mean of its divisors is an integer number (1667811).

Almost surely, 2^18522401 is an apocalyptic number.

It is an amenable number.

18522401 is a deficient number, since it is larger than the sum of its proper divisors (1491331).

18522401 is an equidigital number, since it uses as much as digits as its factorization.

18522401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448 (or 389 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 18522401 is about 4303.7659090615. The cubic root of 18522401 is about 264.5853298683.

Adding to 18522401 its reverse (10422581), we get a palindrome (28944982).

The spelling of 18522401 in words is "eighteen million, five hundred twenty-two thousand, four hundred one".