18028237 has 2 divisors, whose sum is σ = 18028238. Its totient is φ = 18028236.

The previous prime is 18028229. The next prime is 18028247. The reversal of 18028237 is 73282081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12524521 + 5503716 = 3539^2 + 2346^2 .

It is an emirp because it is prime and its reverse (73282081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18028237 - 2³ = 18028229 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18028199 and 18028208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18028247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9014118 + 9014119.

It is an arithmetic number, because the mean of its divisors is an integer number (9014119).

Almost surely, 2^18028237 is an apocalyptic number.

It is an amenable number.

18028237 is a deficient number, since it is larger than the sum of its proper divisors (1).

18028237 is an equidigital number, since it uses as much as digits as its factorization.

18028237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 18028237 is about 4245.9671454216. The cubic root of 18028237 is about 262.2111083326.

The spelling of 18028237 in words is "eighteen million, twenty-eight thousand, two hundred thirty-seven".