84475879 has 2 divisors, whose sum is σ = 84475880. Its totient is φ = 84475878.

The previous prime is 84475861. The next prime is 84475903. The reversal of 84475879 is 97857448.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84475879 - 2⁹ = 84475367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84475379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42237939 + 42237940.

It is an arithmetic number, because the mean of its divisors is an integer number (42237940).

Almost surely, 2^84475879 is an apocalyptic number.

84475879 is a deficient number, since it is larger than the sum of its proper divisors (1).

84475879 is an equidigital number, since it uses as much as digits as its factorization.

84475879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2257920, while the sum is 52.

The square root of 84475879 is about 9191.0760523456. The cubic root of 84475879 is about 438.7773893287. Note that the first 3 decimals are identical.

The spelling of 84475879 in words is "eighty-four million, four hundred seventy-five thousand, eight hundred seventy-nine".