8421079 has 2 divisors, whose sum is σ = 8421080. Its totient is φ = 8421078.

The previous prime is 8421071. The next prime is 8421143. The reversal of 8421079 is 9701248.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8421079 - 2³ = 8421071 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8421079.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8421071) 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, 4210539 + 4210540.

It is an arithmetic number, because the mean of its divisors is an integer number (4210540).

Almost surely, 2^8421079 is an apocalyptic number.

8421079 is a deficient number, since it is larger than the sum of its proper divisors (1).

8421079 is an equidigital number, since it uses as much as digits as its factorization.

8421079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 8421079 is about 2901.9095437315. The cubic root of 8421079 is about 203.4491659878.

The spelling of 8421079 in words is "eight million, four hundred twenty-one thousand, seventy-nine".