18008297 has 4 divisors (see below), whose sum is σ = 18255060. Its totient is φ = 17761536.

The previous prime is 18008293. The next prime is 18008311. The reversal of 18008297 is 79280081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79280081 = 2377 ⋅33353.

It can be written as a sum of positive squares in 2 ways, for example, as 4932841 + 13075456 = 2221^2 + 3616^2 .

It is a cyclic number.

It is not a de Polignac number, because 18008297 - 2² = 18008293 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18008293) 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, 123272 + ... + 123417.

It is an arithmetic number, because the mean of its divisors is an integer number (4563765).

Almost surely, 2^18008297 is an apocalyptic number.

It is an amenable number.

18008297 is a deficient number, since it is larger than the sum of its proper divisors (246763).

18008297 is an equidigital number, since it uses as much as digits as its factorization.

18008297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246762.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 18008297 is about 4243.6183852934. The cubic root of 18008297 is about 262.1144004417.

The spelling of 18008297 in words is "eighteen million, eight thousand, two hundred ninety-seven".