18227897 has 4 divisors (see below), whose sum is σ = 19187280. Its totient is φ = 17268516.

The previous prime is 18227887. The next prime is 18227933. The reversal of 18227897 is 79872281.

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.

It is a cyclic number.

It is not a de Polignac number, because 18227897 - 2⁸ = 18227641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18227887) 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, 479663 + ... + 479700.

It is an arithmetic number, because the mean of its divisors is an integer number (4796820).

Almost surely, 2^18227897 is an apocalyptic number.

It is an amenable number.

18227897 is a deficient number, since it is larger than the sum of its proper divisors (959383).

18227897 is an equidigital number, since it uses as much as digits as its factorization.

18227897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959382.

The product of its digits is 112896, while the sum is 44.

The square root of 18227897 is about 4269.4141284256. The cubic root of 18227897 is about 263.1755395348.

The spelling of 18227897 in words is "eighteen million, two hundred twenty-seven thousand, eight hundred ninety-seven".