18266797 has 2 divisors, whose sum is σ = 18266798. Its totient is φ = 18266796.

The previous prime is 18266777. The next prime is 18266827. The reversal of 18266797 is 79766281.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18224361 + 42436 = 4269^2 + 206^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18266797 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18266707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9133398 + 9133399.

It is an arithmetic number, because the mean of its divisors is an integer number (9133399).

Almost surely, 2^18266797 is an apocalyptic number.

It is an amenable number.

18266797 is a deficient number, since it is larger than the sum of its proper divisors (1).

18266797 is an equidigital number, since it uses as much as digits as its factorization.

18266797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 46.

The square root of 18266797 is about 4273.9673606615. The cubic root of 18266797 is about 263.3626200759.

It can be divided in two parts, 18 and 266797, that added together give a triangular number (266815 = T₇₃₀).

The spelling of 18266797 in words is "eighteen million, two hundred sixty-six thousand, seven hundred ninety-seven".