18806797 has 2 divisors, whose sum is σ = 18806798. Its totient is φ = 18806796.

The previous prime is 18806779. The next prime is 18806813. The reversal of 18806797 is 79760881.

Together with previous prime (18806779) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10361961 + 8444836 = 3219^2 + 2906^2 .

It is an emirp because it is prime and its reverse (79760881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18806797 - 2¹¹ = 18804749 is a prime.

It is a super-2 number, since 2×18806797² = 707391226798418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18806717) 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 as a sum of consecutive naturals, namely, 9403398 + 9403399.

It is an arithmetic number, because the mean of its divisors is an integer number (9403399).

Almost surely, 2^18806797 is an apocalyptic number.

It is an amenable number.

18806797 is a deficient number, since it is larger than the sum of its proper divisors (1).

18806797 is an equidigital number, since it uses as much as digits as its factorization.

18806797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 46.

The square root of 18806797 is about 4336.6804124814. The cubic root of 18806797 is about 265.9326199773.

The spelling of 18806797 in words is "eighteen million, eight hundred six thousand, seven hundred ninety-seven".