9999779 has 8 divisors (see below), whose sum is σ = 10678272. Its totient is φ = 9341640.

The previous prime is 9999761. The next prime is 9999823. The reversal of 9999779 is 9779999.

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 9999779 - 2¹² = 9995683 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4067 + ... + 6044.

It is an arithmetic number, because the mean of its divisors is an integer number (1334784).

Almost surely, 2^9999779 is an apocalyptic number.

9999779 is a deficient number, since it is larger than the sum of its proper divisors (678493).

9999779 is a wasteful number, since it uses less digits than its factorization.

9999779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10177.

The product of its digits is 2893401, while the sum is 59.

The square root of 9999779 is about 3162.2427168072. The cubic root of 9999779 is about 215.4418818913.

The spelling of 9999779 in words is "nine million, nine hundred ninety-nine thousand, seven hundred seventy-nine".