18828239 has 2 divisors, whose sum is σ = 18828240. Its totient is φ = 18828238.

The previous prime is 18828203. The next prime is 18828317. The reversal of 18828239 is 93282881.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (93282881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18828239 - 2⁸ = 18827983 is a prime.

It is a super-2 number, since 2×18828239² = 709005167682242, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18828196 and 18828205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18821239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9414119 + 9414120.

It is an arithmetic number, because the mean of its divisors is an integer number (9414120).

Almost surely, 2^18828239 is an apocalyptic number.

18828239 is a deficient number, since it is larger than the sum of its proper divisors (1).

18828239 is an equidigital number, since it uses as much as digits as its factorization.

18828239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 41.

The square root of 18828239 is about 4339.1518756550. The cubic root of 18828239 is about 266.0336466003.

The spelling of 18828239 in words is "eighteen million, eight hundred twenty-eight thousand, two hundred thirty-nine".