99858 has 32 divisors (see below), whose sum is σ = 233280. Its totient is φ = 28160.

The previous prime is 99839. The next prime is 99859. The reversal of 99858 is 85899.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 99858.

It is not an unprimeable number, because it can be changed into a prime (99859) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1078 + ... + 1166.

It is an arithmetic number, because the mean of its divisors is an integer number (7290).

2⁹⁹⁸⁵⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116640).

99858 is an abundant number, since it is smaller than the sum of its proper divisors (133422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99858 is a wasteful number, since it uses less digits than its factorization.

99858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122.

The product of its digits is 25920, while the sum is 39.

The square root of 99858 is about 316.0031645411. The cubic root of 99858 is about 46.3939077415.

The spelling of 99858 in words is "ninety-nine thousand, eight hundred fifty-eight".