99823993 has 4 divisors (see below), whose sum is σ = 99902608. Its totient is φ = 99745380.

The previous prime is 99823991. The next prime is 99824009. The reversal of 99823993 is 39932899.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39932899 = 23 ⋅1736213.

It is a cyclic number.

It is not a de Polignac number, because 99823993 - 2¹ = 99823991 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99823993.

It is not an unprimeable number, because it can be changed into a prime (99823991) 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, 37371 + ... + 39952.

It is an arithmetic number, because the mean of its divisors is an integer number (24975652).

Almost surely, 2^99823993 is an apocalyptic number.

It is an amenable number.

99823993 is a deficient number, since it is larger than the sum of its proper divisors (78615).

99823993 is a wasteful number, since it uses less digits than its factorization.

99823993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78614.

The product of its digits is 944784, while the sum is 52.

The square root of 99823993 is about 9991.1957742805. The cubic root of 99823993 is about 463.8864060637.

The spelling of 99823993 in words is "ninety-nine million, eight hundred twenty-three thousand, nine hundred ninety-three".