18260857 has 2 divisors, whose sum is σ = 18260858. Its totient is φ = 18260856.

The previous prime is 18260849. The next prime is 18260861. The reversal of 18260857 is 75806281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10086976 + 8173881 = 3176^2 + 2859^2 .

It is a cyclic number.

It is not a de Polignac number, because 18260857 - 2³ = 18260849 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18260887) 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, 9130428 + 9130429.

It is an arithmetic number, because the mean of its divisors is an integer number (9130429).

Almost surely, 2^18260857 is an apocalyptic number.

It is an amenable number.

18260857 is a deficient number, since it is larger than the sum of its proper divisors (1).

18260857 is an equidigital number, since it uses as much as digits as its factorization.

18260857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 18260857 is about 4273.2723994616. The cubic root of 18260857 is about 263.3340702146.

The spelling of 18260857 in words is "eighteen million, two hundred sixty thousand, eight hundred fifty-seven".