28242239 has 2 divisors, whose sum is σ = 28242240. Its totient is φ = 28242238.

The previous prime is 28242223. The next prime is 28242241. The reversal of 28242239 is 93224282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28242239 - 2⁴ = 28242223 is a prime.

Together with 28242241, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28242289) 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, 14121119 + 14121120.

It is an arithmetic number, because the mean of its divisors is an integer number (14121120).

Almost surely, 2^28242239 is an apocalyptic number.

28242239 is a deficient number, since it is larger than the sum of its proper divisors (1).

28242239 is an equidigital number, since it uses as much as digits as its factorization.

28242239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 32.

The square root of 28242239 is about 5314.3427627506. The cubic root of 28242239 is about 304.5320747452.

The spelling of 28242239 in words is "twenty-eight million, two hundred forty-two thousand, two hundred thirty-nine".