789977 has 2 divisors, whose sum is σ = 789978. Its totient is φ = 789976.

The previous prime is 789967. The next prime is 789979. The reversal of 789977 is 779987.

789977 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., 502681 + 287296 = 709^2 + 536^2 .

It is a cyclic number.

It is not a de Polignac number, because 789977 - 2⁴ = 789961 is a prime.

Together with 789979, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (789979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 394988 + 394989.

It is an arithmetic number, because the mean of its divisors is an integer number (394989).

2⁷⁸⁹⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

789977 is a deficient number, since it is larger than the sum of its proper divisors (1).

789977 is an equidigital number, since it uses as much as digits as its factorization.

789977 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 789977 is about 888.8065031265. The cubic root of 789977 is about 92.4424575155.

The spelling of 789977 in words is "seven hundred eighty-nine thousand, nine hundred seventy-seven".