18198737 has 2 divisors, whose sum is σ = 18198738. Its totient is φ = 18198736.

The previous prime is 18198701. The next prime is 18198743. The reversal of 18198737 is 73789181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13868176 + 4330561 = 3724^2 + 2081^2 .

It is a cyclic number.

It is not a de Polignac number, because 18198737 - 2¹⁸ = 17936593 is a prime.

It is not a weakly prime, because it can be changed into another prime (18198757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9099368 + 9099369.

It is an arithmetic number, because the mean of its divisors is an integer number (9099369).

Almost surely, 2^18198737 is an apocalyptic number.

It is an amenable number.

18198737 is a deficient number, since it is larger than the sum of its proper divisors (1).

18198737 is an equidigital number, since it uses as much as digits as its factorization.

18198737 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 44.

The square root of 18198737 is about 4265.9977730890. The cubic root of 18198737 is about 263.0351266532.

The spelling of 18198737 in words is "eighteen million, one hundred ninety-eight thousand, seven hundred thirty-seven".