84399859 has 2 divisors, whose sum is σ = 84399860. Its totient is φ = 84399858.

The previous prime is 84399851. The next prime is 84399869. The reversal of 84399859 is 95899348.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84399859 - 2³ = 84399851 is a prime.

It is not a weakly prime, because it can be changed into another prime (84399851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42199929 + 42199930.

It is an arithmetic number, because the mean of its divisors is an integer number (42199930).

Almost surely, 2^84399859 is an apocalyptic number.

84399859 is a deficient number, since it is larger than the sum of its proper divisors (1).

84399859 is an equidigital number, since it uses as much as digits as its factorization.

84399859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2799360, while the sum is 55.

The square root of 84399859 is about 9186.9395883504. The cubic root of 84399859 is about 438.6457309657.

It can be divided in two parts, 84399 and 859, that added together give a palindrome (85258).

The spelling of 84399859 in words is "eighty-four million, three hundred ninety-nine thousand, eight hundred fifty-nine".