99899993 has 4 divisors (see below), whose sum is σ = 99951540. Its totient is φ = 99848448.

The previous prime is 99899981. The next prime is 99899999. The reversal of 99899993 is 39999899.

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

It can be written as a sum of positive squares in 2 ways, for example, as 40347904 + 59552089 = 6352^2 + 7717^2 .

It is a cyclic number.

It is not a de Polignac number, because 99899993 - 2¹⁰ = 99898969 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (99899999) 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, 22748 + ... + 26781.

It is an arithmetic number, because the mean of its divisors is an integer number (24987885).

Almost surely, 2^99899993 is an apocalyptic number.

It is an amenable number.

99899993 is a deficient number, since it is larger than the sum of its proper divisors (51547).

99899993 is a wasteful number, since it uses less digits than its factorization.

99899993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51546.

The product of its digits is 12754584, while the sum is 65.

The square root of 99899993 is about 9994.9983991995. The cubic root of 99899993 is about 464.0041012940.

The spelling of 99899993 in words is "ninety-nine million, eight hundred ninety-nine thousand, nine hundred ninety-three".