28147439 has 2 divisors, whose sum is σ = 28147440. Its totient is φ = 28147438.

The previous prime is 28147433. The next prime is 28147447. The reversal of 28147439 is 93474182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28147439 - 2⁸ = 28147183 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28147433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14073719 + 14073720.

It is an arithmetic number, because the mean of its divisors is an integer number (14073720).

Almost surely, 2^28147439 is an apocalyptic number.

28147439 is a deficient number, since it is larger than the sum of its proper divisors (1).

28147439 is an equidigital number, since it uses as much as digits as its factorization.

28147439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 38.

The square root of 28147439 is about 5305.4160063090. The cubic root of 28147439 is about 304.1909544460.

The spelling of 28147439 in words is "twenty-eight million, one hundred forty-seven thousand, four hundred thirty-nine".