9900779 has 4 divisors (see below), whose sum is σ = 11315184. Its totient is φ = 8486376.

The previous prime is 9900773. The next prime is 9900799. The reversal of 9900779 is 9770099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9770099 = 937 ⋅10427.

It is a cyclic number.

It is not a de Polignac number, because 9900779 - 2²⁰ = 8852203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9900773) 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, 707192 + ... + 707205.

It is an arithmetic number, because the mean of its divisors is an integer number (2828796).

Almost surely, 2^9900779 is an apocalyptic number.

9900779 is a deficient number, since it is larger than the sum of its proper divisors (1414405).

9900779 is a wasteful number, since it uses less digits than its factorization.

9900779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414404.

The product of its (nonzero) digits is 35721, while the sum is 41.

The square root of 9900779 is about 3146.5503333015. The cubic root of 9900779 is about 214.7285487122.

The spelling of 9900779 in words is "nine million, nine hundred thousand, seven hundred seventy-nine".