84020879 has 2 divisors, whose sum is σ = 84020880. Its totient is φ = 84020878.

The previous prime is 84020843. The next prime is 84020927. The reversal of 84020879 is 97802048.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84020879 - 2¹² = 84016783 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 (84020809) 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, 42010439 + 42010440.

It is an arithmetic number, because the mean of its divisors is an integer number (42010440).

Almost surely, 2^84020879 is an apocalyptic number.

84020879 is a deficient number, since it is larger than the sum of its proper divisors (1).

84020879 is an equidigital number, since it uses as much as digits as its factorization.

84020879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 84020879 is about 9166.2903619730. The cubic root of 84020879 is about 437.9881966892.

The spelling of 84020879 in words is "eighty-four million, twenty thousand, eight hundred seventy-nine".