99939993 has 16 divisors (see below), whose sum is σ = 136105536. Its totient is φ = 65214720.

The previous prime is 99939967. The next prime is 99940007. The reversal of 99939993 is 39993999.

It is not a de Polignac number, because 99939993 - 2⁶ = 99939929 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (99939913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28338 + ... + 31668.

It is an arithmetic number, because the mean of its divisors is an integer number (8506596).

Almost surely, 2^99939993 is an apocalyptic number.

It is an amenable number.

99939993 is a deficient number, since it is larger than the sum of its proper divisors (36165543).

99939993 is a wasteful number, since it uses less digits than its factorization.

99939993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3544.

The product of its digits is 4782969, while the sum is 60.

The square root of 99939993 is about 9996.9991997599. Note that the first 3 decimals coincide. The cubic root of 99939993 is about 464.0660221774.

The spelling of 99939993 in words is "ninety-nine million, nine hundred thirty-nine thousand, nine hundred ninety-three".