99993605 has 4 divisors (see below), whose sum is σ = 119992332. Its totient is φ = 79994880.

The previous prime is 99993601. The next prime is 99993611. The reversal of 99993605 is 50639999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50639999 = 181 ⋅279779.

It can be written as a sum of positive squares in 2 ways, for example, as 39262756 + 60730849 = 6266^2 + 7793^2 .

It is not a de Polignac number, because 99993605 - 2² = 99993601 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 (99993601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9999356 + ... + 9999365.

It is an arithmetic number, because the mean of its divisors is an integer number (29998083).

Almost surely, 2^99993605 is an apocalyptic number.

It is an amenable number.

99993605 is a deficient number, since it is larger than the sum of its proper divisors (19998727).

99993605 is a wasteful number, since it uses less digits than its factorization.

99993605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19998726.

The product of its (nonzero) digits is 590490, while the sum is 50.

The square root of 99993605 is about 9999.6802448878. The cubic root of 99993605 is about 464.1489888302.

The spelling of 99993605 in words is "ninety-nine million, nine hundred ninety-three thousand, six hundred five".