18495973 has 2 divisors, whose sum is σ = 18495974. Its totient is φ = 18495972.

The previous prime is 18495947. The next prime is 18495989. The reversal of 18495973 is 37959481.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14010049 + 4485924 = 3743^2 + 2118^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18495973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18495923) 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, 9247986 + 9247987.

It is an arithmetic number, because the mean of its divisors is an integer number (9247987).

Almost surely, 2^18495973 is an apocalyptic number.

It is an amenable number.

18495973 is a deficient number, since it is larger than the sum of its proper divisors (1).

18495973 is an equidigital number, since it uses as much as digits as its factorization.

18495973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 46.

The square root of 18495973 is about 4300.6944788022. The cubic root of 18495973 is about 264.4594320544.

It can be divided in two parts, 1849597 and 3, that added together give a square (1849600 = 1360²).

The spelling of 18495973 in words is "eighteen million, four hundred ninety-five thousand, nine hundred seventy-three".