99999805 has 8 divisors (see below), whose sum is σ = 120222432. Its totient is φ = 79851408.

The previous prime is 99999787. The next prime is 99999821. The reversal of 99999805 is 50899999.

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 99999805 - 2⁵ = 99999773 is a prime.

It is a super-2 number, since 2×99999805² = 19999922000076050, which contains 22 as substring.

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 99999805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15547 + ... + 21016.

It is an arithmetic number, because the mean of its divisors is an integer number (15027804).

Almost surely, 2^99999805 is an apocalyptic number.

It is an amenable number.

99999805 is a deficient number, since it is larger than the sum of its proper divisors (20222627).

99999805 is a wasteful number, since it uses less digits than its factorization.

99999805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37115.

The product of its (nonzero) digits is 2361960, while the sum is 58.

The square root of 99999805 is about 9999.9902499952. The cubic root of 99999805 is about 464.1585816578.

The spelling of 99999805 in words is "ninety-nine million, nine hundred ninety-nine thousand, eight hundred five".