7779997 has 2 divisors, whose sum is σ = 7779998. Its totient is φ = 7779996.

The previous prime is 7779991. The next prime is 7780007. The reversal of 7779997 is 7999777.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4372281 + 3407716 = 2091^2 + 1846^2 .

It is a cyclic number.

It is not a de Polignac number, because 7779997 - 2⁷ = 7779869 is a prime.

7779997 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7779991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3889998 + 3889999.

It is an arithmetic number, because the mean of its divisors is an integer number (3889999).

Almost surely, 2^7779997 is an apocalyptic number.

It is an amenable number.

7779997 is a deficient number, since it is larger than the sum of its proper divisors (1).

7779997 is an equidigital number, since it uses as much as digits as its factorization.

7779997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1750329, while the sum is 55.

The square root of 7779997 is about 2789.2645984202. The cubic root of 7779997 is about 198.1495740863.

The spelling of 7779997 in words is "seven million, seven hundred seventy-nine thousand, nine hundred ninety-seven".