9972779 has 2 divisors, whose sum is σ = 9972780. Its totient is φ = 9972778.

The previous prime is 9972773. The next prime is 9972803. The reversal of 9972779 is 9772799.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9972779 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (9972773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4986389 + 4986390.

It is an arithmetic number, because the mean of its divisors is an integer number (4986390).

Almost surely, 2^9972779 is an apocalyptic number.

9972779 is a deficient number, since it is larger than the sum of its proper divisors (1).

9972779 is an equidigital number, since it uses as much as digits as its factorization.

9972779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 500094, while the sum is 50.

The square root of 9972779 is about 3157.9707091739. The cubic root of 9972779 is about 215.2478051344.

The spelling of 9972779 in words is "nine million, nine hundred seventy-two thousand, seven hundred seventy-nine".