84899999 has 4 divisors (see below), whose sum is σ = 89368440. Its totient is φ = 80431560.

The previous prime is 84899981. The next prime is 84900007. The reversal of 84899999 is 99999848.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 84899999 - 2⁸ = 84899743 is a prime.

It is a Duffinian number.

84899999 is a modest number, since divided by 9999 gives 8489 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84899909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2234192 + ... + 2234229.

It is an arithmetic number, because the mean of its divisors is an integer number (22342110).

Almost surely, 2^84899999 is an apocalyptic number.

84899999 is a deficient number, since it is larger than the sum of its proper divisors (4468441).

84899999 is a wasteful number, since it uses less digits than its factorization.

84899999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4468440.

The product of its digits is 15116544, while the sum is 65.

The square root of 84899999 is about 9214.1195455670. The cubic root of 84899999 is about 439.5104731354.

The spelling of 84899999 in words is "eighty-four million, eight hundred ninety-nine thousand, nine hundred ninety-nine".