99870 has 16 divisors (see below), whose sum is σ = 239760. Its totient is φ = 26624.

The previous prime is 99859. The next prime is 99871. The reversal of 99870 is 7899.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 99870.

It is not an unprimeable number, because it can be changed into a prime (99871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1635 + ... + 1694.

It is an arithmetic number, because the mean of its divisors is an integer number (14985).

2⁹⁹⁸⁷⁰ is an apocalyptic number.

99870 is an abundant number, since it is smaller than the sum of its proper divisors (139890).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119880).

99870 is a wasteful number, since it uses less digits than its factorization.

99870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3339.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 99870 is about 316.0221511224. The cubic root of 99870 is about 46.3957660623.

It can be divided in two parts, 99 and 870, that added together give a palindrome (969).

The spelling of 99870 in words is "ninety-nine thousand, eight hundred seventy".