18806237 has 2 divisors, whose sum is σ = 18806238. Its totient is φ = 18806236.

The previous prime is 18806209. The next prime is 18806261. The reversal of 18806237 is 73260881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14830201 + 3976036 = 3851^2 + 1994^2 .

It is an emirp because it is prime and its reverse (73260881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18806237 - 2⁶ = 18806173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18806197 and 18806206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18806737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9403118 + 9403119.

It is an arithmetic number, because the mean of its divisors is an integer number (9403119).

Almost surely, 2^18806237 is an apocalyptic number.

It is an amenable number.

18806237 is a deficient number, since it is larger than the sum of its proper divisors (1).

18806237 is an equidigital number, since it uses as much as digits as its factorization.

18806237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 18806237 is about 4336.6158464868. The cubic root of 18806237 is about 265.9299804396.

The spelling of 18806237 in words is "eighteen million, eight hundred six thousand, two hundred thirty-seven".