778397 has 2 divisors, whose sum is σ = 778398. Its totient is φ = 778396.

The previous prime is 778391. The next prime is 778403. The reversal of 778397 is 793877.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (778391) and next prime (778403).

It can be written as a sum of positive squares in only one way, i.e., 534361 + 244036 = 731^2 + 494^2 .

It is a cyclic number.

It is not a de Polignac number, because 778397 - 2⁶ = 778333 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (778391) 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, 389198 + 389199.

It is an arithmetic number, because the mean of its divisors is an integer number (389199).

2⁷⁷⁸³⁹⁷ is an apocalyptic number.

It is an amenable number.

778397 is a deficient number, since it is larger than the sum of its proper divisors (1).

778397 is an equidigital number, since it uses as much as digits as its factorization.

778397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 74088, while the sum is 41.

The square root of 778397 is about 882.2680998427. The cubic root of 778397 is about 91.9885382697.

The spelling of 778397 in words is "seven hundred seventy-eight thousand, three hundred ninety-seven".