18683237 has 2 divisors, whose sum is σ = 18683238. Its totient is φ = 18683236.

The previous prime is 18683219. The next prime is 18683239. The reversal of 18683237 is 73238681.

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., 12773476 + 5909761 = 3574^2 + 2431^2 .

It is an emirp because it is prime and its reverse (73238681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18683237 - 2⁸ = 18682981 is a prime.

Together with 18683239, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18683237.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18683239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9341618 + 9341619.

It is an arithmetic number, because the mean of its divisors is an integer number (9341619).

Almost surely, 2^18683237 is an apocalyptic number.

It is an amenable number.

18683237 is a deficient number, since it is larger than the sum of its proper divisors (1).

18683237 is an equidigital number, since it uses as much as digits as its factorization.

18683237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 38.

The square root of 18683237 is about 4322.4110170135. The cubic root of 18683237 is about 265.3489505312.

The spelling of 18683237 in words is "eighteen million, six hundred eighty-three thousand, two hundred thirty-seven".