84999999 has 8 divisors (see below), whose sum is σ = 129523840. Its totient is φ = 48571416.

The previous prime is 84999979. The next prime is 85000007. The reversal of 84999999 is 99999948.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 84999999 - 2⁹ = 84999487 is a prime.

It is a Duffinian number.

84999999 is a modest number, since divided by 9999 gives 8499 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84999979) 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 in 7 ways as a sum of consecutive naturals, for example, 2023789 + ... + 2023830.

It is an arithmetic number, because the mean of its divisors is an integer number (16190480).

Almost surely, 2^84999999 is an apocalyptic number.

84999999 is a deficient number, since it is larger than the sum of its proper divisors (44523841).

84999999 is a wasteful number, since it uses less digits than its factorization.

84999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4047629.

The product of its digits is 17006112, while the sum is 66.

The square root of 84999999 is about 9219.5444030603. The cubic root of 84999999 is about 439.6829654916.

The spelling of 84999999 in words is "eighty-four million, nine hundred ninety-nine thousand, nine hundred ninety-nine".