747977 has 2 divisors, whose sum is σ = 747978. Its totient is φ = 747976.

The previous prime is 747953. The next prime is 747979. The reversal of 747977 is 779747.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 383161 + 364816 = 619^2 + 604^2 .

It is an emirp because it is prime and its reverse (779747) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 747977 - 2¹² = 743881 is a prime.

Together with 747979, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 15.

It is not a weakly prime, because it can be changed into another prime (747979) 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, 373988 + 373989.

It is an arithmetic number, because the mean of its divisors is an integer number (373989).

2⁷⁴⁷⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

747977 is a deficient number, since it is larger than the sum of its proper divisors (1).

747977 is an equidigital number, since it uses as much as digits as its factorization.

747977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86436, while the sum is 41.

The square root of 747977 is about 864.8566355183. The cubic root of 747977 is about 90.7742664175.

The spelling of 747977 in words is "seven hundred forty-seven thousand, nine hundred seventy-seven".