99939799 has 4 divisors (see below), whose sum is σ = 100824336. Its totient is φ = 99055264.

The previous prime is 99939797. The next prime is 99939841. The reversal of 99939799 is 99793999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99793999 = 599 ⋅166601.

It is a cyclic number.

It is not a de Polignac number, because 99939799 - 2¹ = 99939797 is a prime.

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 99939799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99939797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 442099 + ... + 442324.

It is an arithmetic number, because the mean of its divisors is an integer number (25206084).

Almost surely, 2^99939799 is an apocalyptic number.

99939799 is a deficient number, since it is larger than the sum of its proper divisors (884537).

99939799 is a wasteful number, since it uses less digits than its factorization.

99939799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884536.

The product of its digits is 11160261, while the sum is 64.

The square root of 99939799 is about 9996.9894968435. The cubic root of 99939799 is about 464.0657219009.

The spelling of 99939799 in words is "ninety-nine million, nine hundred thirty-nine thousand, seven hundred ninety-nine".