18226289 has 4 divisors (see below), whose sum is σ = 18251124. Its totient is φ = 18201456.

The previous prime is 18226279. The next prime is 18226309. The reversal of 18226289 is 98262281.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14691889 + 3534400 = 3833^2 + 1880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18226289 is a prime.

It is a super-2 number, since 2×18226289² = 664395221423042, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18226249) 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, 11282 + ... + 12795.

It is an arithmetic number, because the mean of its divisors is an integer number (4562781).

Almost surely, 2^18226289 is an apocalyptic number.

It is an amenable number.

18226289 is a deficient number, since it is larger than the sum of its proper divisors (24835).

18226289 is an equidigital number, since it uses as much as digits as its factorization.

18226289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24834.

The product of its digits is 27648, while the sum is 38.

The square root of 18226289 is about 4269.2258080359. The cubic root of 18226289 is about 263.1678005050.

The spelling of 18226289 in words is "eighteen million, two hundred twenty-six thousand, two hundred eighty-nine".