28442839 has 2 divisors, whose sum is σ = 28442840. Its totient is φ = 28442838.

The previous prime is 28442837. The next prime is 28442857. The reversal of 28442839 is 93824482.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28442839 - 2¹ = 28442837 is a prime.

Together with 28442837, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28442831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14221419 + 14221420.

It is an arithmetic number, because the mean of its divisors is an integer number (14221420).

Almost surely, 2^28442839 is an apocalyptic number.

28442839 is a deficient number, since it is larger than the sum of its proper divisors (1).

28442839 is an equidigital number, since it uses as much as digits as its factorization.

28442839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110592, while the sum is 40.

The square root of 28442839 is about 5333.1828207929. The cubic root of 28442839 is about 305.2513881922.

The spelling of 28442839 in words is "twenty-eight million, four hundred forty-two thousand, eight hundred thirty-nine".