18568997 has 4 divisors (see below), whose sum is σ = 18579456. Its totient is φ = 18558540.

The previous prime is 18568993. The next prime is 18568999. The reversal of 18568997 is 79986581.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 79986581 = 17 ⋅4705093.

It is a cyclic number.

It is not a de Polignac number, because 18568997 - 2² = 18568993 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18568993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1829 + ... + 6362.

It is an arithmetic number, because the mean of its divisors is an integer number (4644864).

Almost surely, 2^18568997 is an apocalyptic number.

It is an amenable number.

18568997 is a deficient number, since it is larger than the sum of its proper divisors (10459).

18568997 is an equidigital number, since it uses as much as digits as its factorization.

18568997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10458.

The product of its digits is 1088640, while the sum is 53.

The square root of 18568997 is about 4309.1759072936. The cubic root of 18568997 is about 264.8070126884.

The spelling of 18568997 in words is "eighteen million, five hundred sixty-eight thousand, nine hundred ninety-seven".