99929999 has 4 divisors (see below), whose sum is σ = 107616936. Its totient is φ = 92243064.

The previous prime is 99929983. The next prime is 99930013. The reversal of 99929999 is 99992999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99992999 = 9227 ⋅10837.

It is a cyclic number.

It is not a de Polignac number, because 99929999 - 2⁴ = 99929983 is a prime.

It is a Duffinian number.

99929999 is a modest number, since divided by 9999 gives 9992 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99929909) 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, 3843449 + ... + 3843474.

It is an arithmetic number, because the mean of its divisors is an integer number (26904234).

Almost surely, 2^99929999 is an apocalyptic number.

99929999 is a deficient number, since it is larger than the sum of its proper divisors (7686937).

99929999 is a wasteful number, since it uses less digits than its factorization.

99929999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7686936.

The product of its digits is 9565938, while the sum is 65.

The square root of 99929999 is about 9996.4993372680. The cubic root of 99929999 is about 464.0505527932.

It can be divided in two parts, 9992 and 9999, that added together give a palindrome (19991).

The spelling of 99929999 in words is "ninety-nine million, nine hundred twenty-nine thousand, nine hundred ninety-nine".