28421443 has 2 divisors, whose sum is σ = 28421444. Its totient is φ = 28421442.

The previous prime is 28421413. The next prime is 28421531. The reversal of 28421443 is 34412482.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28421443 - 2⁵ = 28421411 is a prime.

It is not a weakly prime, because it can be changed into another prime (28421413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14210721 + 14210722.

It is an arithmetic number, because the mean of its divisors is an integer number (14210722).

Almost surely, 2^28421443 is an apocalyptic number.

28421443 is a deficient number, since it is larger than the sum of its proper divisors (1).

28421443 is an equidigital number, since it uses as much as digits as its factorization.

28421443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6144, while the sum is 28.

The square root of 28421443 is about 5331.1765118030. The cubic root of 28421443 is about 305.1748276555.

The spelling of 28421443 in words is "twenty-eight million, four hundred twenty-one thousand, four hundred forty-three".