18226401 has 4 divisors (see below), whose sum is σ = 24301872. Its totient is φ = 12150932.

The previous prime is 18226393. The next prime is 18226409. The reversal of 18226401 is 10462281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10462281 = 3 ⋅3487427.

It is an interprime number because it is at equal distance from previous prime (18226393) and next prime (18226409).

It is a cyclic number.

It is not a de Polignac number, because 18226401 - 2³ = 18226393 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18226409) 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 in 3 ways as a sum of consecutive naturals, for example, 3037731 + ... + 3037736.

It is an arithmetic number, because the mean of its divisors is an integer number (6075468).

Almost surely, 2^18226401 is an apocalyptic number.

It is an amenable number.

18226401 is a deficient number, since it is larger than the sum of its proper divisors (6075471).

18226401 is an equidigital number, since it uses as much as digits as its factorization.

18226401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6075470.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 18226401 is about 4269.2389251481. The cubic root of 18226401 is about 263.1683395567.

Adding to 18226401 its reverse (10462281), we get a palindrome (28688682).

The spelling of 18226401 in words is "eighteen million, two hundred twenty-six thousand, four hundred one".