18097643 has 4 divisors (see below), whose sum is σ = 18125208. Its totient is φ = 18070080.

The previous prime is 18097637. The next prime is 18097669. The reversal of 18097643 is 34679081.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18097643 - 2⁶ = 18097579 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18097597 and 18097606.

It is not an unprimeable number, because it can be changed into a prime (18097613) 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, 12773 + ... + 14118.

It is an arithmetic number, because the mean of its divisors is an integer number (4531302).

Almost surely, 2^18097643 is an apocalyptic number.

18097643 is a deficient number, since it is larger than the sum of its proper divisors (27565).

18097643 is an equidigital number, since it uses as much as digits as its factorization.

18097643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27564.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 18097643 is about 4254.1324615014. The cubic root of 18097643 is about 262.5471685457.

The spelling of 18097643 in words is "eighteen million, ninety-seven thousand, six hundred forty-three".