989777 has 2 divisors, whose sum is σ = 989778. Its totient is φ = 989776.

The previous prime is 989761. The next prime is 989783. The reversal of 989777 is 777989.

989777 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 863041 + 126736 = 929^2 + 356^2 .

It is an emirp because it is prime and its reverse (777989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 989777 - 2⁴ = 989761 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (989797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494888 + 494889.

It is an arithmetic number, because the mean of its divisors is an integer number (494889).

2⁹⁸⁹⁷⁷⁷ is an apocalyptic number.

It is an amenable number.

989777 is a deficient number, since it is larger than the sum of its proper divisors (1).

989777 is an equidigital number, since it uses as much as digits as its factorization.

989777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 222264, while the sum is 47.

The square root of 989777 is about 994.8753690790. The cubic root of 989777 is about 99.6580654738.

The spelling of 989777 in words is "nine hundred eighty-nine thousand, seven hundred seventy-seven".