9977999 has 2 divisors, whose sum is σ = 9978000. Its totient is φ = 9977998.

The previous prime is 9977993. The next prime is 9978037. The reversal of 9977999 is 9997799.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9977999 - 2⁸ = 9977743 is a prime.

It is a zygodrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9977993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4988999 + 4989000.

It is an arithmetic number, because the mean of its divisors is an integer number (4989000).

Almost surely, 2^9977999 is an apocalyptic number.

9977999 is a deficient number, since it is larger than the sum of its proper divisors (1).

9977999 is an equidigital number, since it uses as much as digits as its factorization.

9977999 is an odious number, because the sum of its binary digits is odd.

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

The square root of 9977999 is about 3158.7970811687. The cubic root of 9977999 is about 215.2853539314.

The spelling of 9977999 in words is "nine million, nine hundred seventy-seven thousand, nine hundred ninety-nine".