18122297 has 4 divisors (see below), whose sum is σ = 18143616. Its totient is φ = 18100980.

The previous prime is 18122243. The next prime is 18122309. The reversal of 18122297 is 79222181.

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: 79222181 = 109 ⋅726809.

It is a cyclic number.

It is not a de Polignac number, because 18122297 - 2¹⁶ = 18056761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18122207) 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, 9329 + ... + 11102.

It is an arithmetic number, because the mean of its divisors is an integer number (4535904).

Almost surely, 2^18122297 is an apocalyptic number.

It is an amenable number.

18122297 is a deficient number, since it is larger than the sum of its proper divisors (21319).

18122297 is an equidigital number, since it uses as much as digits as its factorization.

18122297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21318.

The product of its digits is 4032, while the sum is 32.

The square root of 18122297 is about 4257.0291283946. The cubic root of 18122297 is about 262.6663350922. Note that the first 3 decimals are identical.

The spelling of 18122297 in words is "eighteen million, one hundred twenty-two thousand, two hundred ninety-seven".