780397 has 2 divisors, whose sum is σ = 780398. Its totient is φ = 780396.

The previous prime is 780389. The next prime is 780401. The reversal of 780397 is 793087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 498436 + 281961 = 706^2 + 531^2 .

It is a cyclic number.

It is not a de Polignac number, because 780397 - 2³ = 780389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (780347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390198 + 390199.

It is an arithmetic number, because the mean of its divisors is an integer number (390199).

2⁷⁸⁰³⁹⁷ is an apocalyptic number.

It is an amenable number.

780397 is a deficient number, since it is larger than the sum of its proper divisors (1).

780397 is an equidigital number, since it uses as much as digits as its factorization.

780397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 780397 is about 883.4008150325. The cubic root of 780397 is about 92.0672554846.

The spelling of 780397 in words is "seven hundred eighty thousand, three hundred ninety-seven".