989797 has 2 divisors, whose sum is σ = 989798. Its totient is φ = 989796.

The previous prime is 989783. The next prime is 989803. The reversal of 989797 is 797989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 772641 + 217156 = 879^2 + 466^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 989797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989777) 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 as a sum of consecutive naturals, namely, 494898 + 494899.

It is an arithmetic number, because the mean of its divisors is an integer number (494899).

2⁹⁸⁹⁷⁹⁷ is an apocalyptic number.

It is an amenable number.

989797 is a deficient number, since it is larger than the sum of its proper divisors (1).

989797 is an equidigital number, since it uses as much as digits as its factorization.

989797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 285768, while the sum is 49.

The square root of 989797 is about 994.8854205385. The cubic root of 989797 is about 99.6587367185.

The spelling of 989797 in words is "nine hundred eighty-nine thousand, seven hundred ninety-seven".