18227609 has 4 divisors (see below), whose sum is σ = 18239616. Its totient is φ = 18215604.

The previous prime is 18227537. The next prime is 18227611. The reversal of 18227609 is 90672281.

It is a happy number.

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: 90672281 = 7 ⋅12953183.

It is a cyclic number.

It is not a de Polignac number, because 18227609 - 2²⁰ = 17179033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18227309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3329 + ... + 6894.

It is an arithmetic number, because the mean of its divisors is an integer number (4559904).

Almost surely, 2^18227609 is an apocalyptic number.

It is an amenable number.

18227609 is a deficient number, since it is larger than the sum of its proper divisors (12007).

18227609 is a wasteful number, since it uses less digits than its factorization.

18227609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12006.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 18227609 is about 4269.3804000112. The cubic root of 18227609 is about 263.1741534734.

The spelling of 18227609 in words is "eighteen million, two hundred twenty-seven thousand, six hundred nine".