778459397 has 2 divisors, whose sum is σ = 778459398. Its totient is φ = 778459396.

The previous prime is 778459379. The next prime is 778459411. The reversal of 778459397 is 793954877.

Together with previous prime (778459379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 491021281 + 287438116 = 22159^2 + 16954^2 .

It is a cyclic number.

It is not a de Polignac number, because 778459397 - 2⁸ = 778459141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (778059397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389229698 + 389229699.

It is an arithmetic number, because the mean of its divisors is an integer number (389229699).

Almost surely, 2^778459397 is an apocalyptic number.

It is an amenable number.

778459397 is a deficient number, since it is larger than the sum of its proper divisors (1).

778459397 is an equidigital number, since it uses as much as digits as its factorization.

778459397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13335840, while the sum is 59.

The square root of 778459397 is about 27900.8852368523. The cubic root of 778459397 is about 919.9099616516.

The spelling of 778459397 in words is "seven hundred seventy-eight million, four hundred fifty-nine thousand, three hundred ninety-seven".