99999823 has 8 divisors (see below), whose sum is σ = 124675200. Its totient is φ = 77921880.

The previous prime is 99999821. The next prime is 99999827. The reversal of 99999823 is 32899999.

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

It is a cyclic number.

It is not a de Polignac number, because 99999823 - 2¹ = 99999821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999821) 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, 649273 + ... + 649426.

It is an arithmetic number, because the mean of its divisors is an integer number (15584400).

Almost surely, 2^99999823 is an apocalyptic number.

99999823 is a deficient number, since it is larger than the sum of its proper divisors (24675377).

99999823 is a wasteful number, since it uses less digits than its factorization.

99999823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1298717.

The product of its digits is 2834352, while the sum is 58.

The square root of 99999823 is about 9999.9911499961. The cubic root of 99999823 is about 464.1586095074.

The spelling of 99999823 in words is "ninety-nine million, nine hundred ninety-nine thousand, eight hundred twenty-three".