7977797 has 2 divisors, whose sum is σ = 7977798. Its totient is φ = 7977796.

The previous prime is 7977793. The next prime is 7977799.

7977797 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5317636 + 2660161 = 2306^2 + 1631^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 7977797 - 2² = 7977793 is a prime.

Together with 7977799, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7977793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3988898 + 3988899.

It is an arithmetic number, because the mean of its divisors is an integer number (3988899).

Almost surely, 2^7977797 is an apocalyptic number.

It is an amenable number.

7977797 is a deficient number, since it is larger than the sum of its proper divisors (1).

7977797 is an equidigital number, since it uses as much as digits as its factorization.

7977797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1361367, while the sum is 53.

The square root of 7977797 is about 2824.4994246769. The cubic root of 7977797 is about 199.8148035643.

The spelling of 7977797 in words is "seven million, nine hundred seventy-seven thousand, seven hundred ninety-seven".