18198757 has 2 divisors, whose sum is σ = 18198758. Its totient is φ = 18198756.

The previous prime is 18198743. The next prime is 18198779. The reversal of 18198757 is 75789181.

It is a Cunningham number, because it is equal to 4266²+1.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18198756 + 1 = 4266^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 18198757 - 2¹¹ = 18196709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18198737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9099378 + 9099379.

It is an arithmetic number, because the mean of its divisors is an integer number (9099379).

Almost surely, 2^18198757 is an apocalyptic number.

It is an amenable number.

18198757 is a deficient number, since it is larger than the sum of its proper divisors (1).

18198757 is an equidigital number, since it uses as much as digits as its factorization.

18198757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 46.

The square root of 18198757 is about 4266.0001172058. Note that the first 3 decimals coincide. The cubic root of 18198757 is about 263.0352230097.

The spelling of 18198757 in words is "eighteen million, one hundred ninety-eight thousand, seven hundred fifty-seven".