778013399 has 2 divisors, whose sum is σ = 778013400. Its totient is φ = 778013398.

The previous prime is 778013317. The next prime is 778013407. The reversal of 778013399 is 993310877.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 778013399 - 2²⁰ = 776964823 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (778013099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389006699 + 389006700.

It is an arithmetic number, because the mean of its divisors is an integer number (389006700).

Almost surely, 2^778013399 is an apocalyptic number.

778013399 is a deficient number, since it is larger than the sum of its proper divisors (1).

778013399 is an equidigital number, since it uses as much as digits as its factorization.

778013399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 285768, while the sum is 47.

The square root of 778013399 is about 27892.8915496404. The cubic root of 778013399 is about 919.7342486205.

The spelling of 778013399 in words is "seven hundred seventy-eight million, thirteen thousand, three hundred ninety-nine".