84478399 has 2 divisors, whose sum is σ = 84478400. Its totient is φ = 84478398.

The previous prime is 84478397. The next prime is 84478417. The reversal of 84478399 is 99387448.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84478399 - 2¹ = 84478397 is a prime.

Together with 84478397, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84478393) 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, 42239199 + 42239200.

It is an arithmetic number, because the mean of its divisors is an integer number (42239200).

Almost surely, 2^84478399 is an apocalyptic number.

84478399 is a deficient number, since it is larger than the sum of its proper divisors (1).

84478399 is an equidigital number, since it uses as much as digits as its factorization.

84478399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 52.

The square root of 84478399 is about 9191.2131408210. The cubic root of 84478399 is about 438.7817523415.

The spelling of 84478399 in words is "eighty-four million, four hundred seventy-eight thousand, three hundred ninety-nine".