779256397 has 2 divisors, whose sum is σ = 779256398. Its totient is φ = 779256396.

The previous prime is 779256391. The next prime is 779256407. The reversal of 779256397 is 793652977.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 399240361 + 380016036 = 19981^2 + 19494^2 .

It is a cyclic number.

It is not a de Polignac number, because 779256397 - 2¹⁵ = 779223629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (779256391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389628198 + 389628199.

It is an arithmetic number, because the mean of its divisors is an integer number (389628199).

Almost surely, 2^779256397 is an apocalyptic number.

It is an amenable number.

779256397 is a deficient number, since it is larger than the sum of its proper divisors (1).

779256397 is an equidigital number, since it uses as much as digits as its factorization.

779256397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5000940, while the sum is 55.

The square root of 779256397 is about 27915.1642839515. The cubic root of 779256397 is about 920.2237944066.

The spelling of 779256397 in words is "seven hundred seventy-nine million, two hundred fifty-six thousand, three hundred ninety-seven".