999996779 has 2 divisors, whose sum is σ = 999996780. Its totient is φ = 999996778.

The previous prime is 999996749. The next prime is 999996827. The reversal of 999996779 is 977699999.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999996779 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999996709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499998389 + 499998390.

It is an arithmetic number, because the mean of its divisors is an integer number (499998390).

Almost surely, 2^999996779 is an apocalyptic number.

999996779 is a deficient number, since it is larger than the sum of its proper divisors (1).

999996779 is an equidigital number, since it uses as much as digits as its factorization.

999996779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 156243654, while the sum is 74.

The square root of 999996779 is about 31622.7256731611. The cubic root of 999996779 is about 999.9989263322.

The spelling of 999996779 in words is "nine hundred ninety-nine million, nine hundred ninety-six thousand, seven hundred seventy-nine".