12797777 has 2 divisors, whose sum is σ = 12797778. Its totient is φ = 12797776.

The previous prime is 12797731. The next prime is 12797797. The reversal of 12797777 is 77779721.

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., 11182336 + 1615441 = 3344^2 + 1271^2 .

It is a cyclic number.

It is not a de Polignac number, because 12797777 - 2⁶ = 12797713 is a prime.

It is a super-2 number, since 2×12797777² = 327566192283458, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12797717) 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, 6398888 + 6398889.

It is an arithmetic number, because the mean of its divisors is an integer number (6398889).

Almost surely, 2^12797777 is an apocalyptic number.

It is an amenable number.

12797777 is a deficient number, since it is larger than the sum of its proper divisors (1).

12797777 is an equidigital number, since it uses as much as digits as its factorization.

12797777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302526, while the sum is 47.

The square root of 12797777 is about 3577.3980768150. The cubic root of 12797777 is about 233.9078764159.

The spelling of 12797777 in words is "twelve million, seven hundred ninety-seven thousand, seven hundred seventy-seven".