9919799 has 4 divisors (see below), whose sum is σ = 10150536. Its totient is φ = 9689064.

The previous prime is 9919727. The next prime is 9919813. The reversal of 9919799 is 9979199.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9979199 = 19 ⋅525221.

It is a cyclic number.

It is not a de Polignac number, because 9919799 - 2⁸ = 9919543 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 9919799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9919199) 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, 115304 + ... + 115389.

It is an arithmetic number, because the mean of its divisors is an integer number (2537634).

Almost surely, 2^9919799 is an apocalyptic number.

9919799 is a deficient number, since it is larger than the sum of its proper divisors (230737).

9919799 is a wasteful number, since it uses less digits than its factorization.

9919799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230736.

The product of its digits is 413343, while the sum is 53.

The square root of 9919799 is about 3149.5712406612. The cubic root of 9919799 is about 214.8659629665.

The spelling of 9919799 in words is "nine million, nine hundred nineteen thousand, seven hundred ninety-nine".