18797 has 2 divisors, whose sum is σ = 18798. Its totient is φ = 18796.

The previous prime is 18793. The next prime is 18803. The reversal of 18797 is 79781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17956 + 841 = 134^2 + 29^2 .

It is a cyclic number.

It is not a de Polignac number, because 18797 - 2² = 18793 is a prime.

It is a Chen prime.

It is a plaindrome in base 8.

It is a nialpdrome in base 12.

It is a zygodrome in base 8.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9398 + 9399.

It is an arithmetic number, because the mean of its divisors is an integer number (9399).

2¹⁸⁷⁹⁷ is an apocalyptic number.

It is an amenable number.

18797 is a deficient number, since it is larger than the sum of its proper divisors (1).

18797 is an equidigital number, since it uses as much as digits as its factorization.

18797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3528, while the sum is 32.

The square root of 18797 is about 137.1021516972. The cubic root of 18797 is about 26.5886434647.

The spelling of 18797 in words is "eighteen thousand, seven hundred ninety-seven".