780869 has 2 divisors, whose sum is σ = 780870. Its totient is φ = 780868.

The previous prime is 780853. The next prime is 780877. The reversal of 780869 is 968087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 744769 + 36100 = 863^2 + 190^2 .

It is a cyclic number.

It is not a de Polignac number, because 780869 - 2⁴ = 780853 is a prime.

It is a super-2 number, since 2×780869² = 1219512790322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (780809) 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, 390434 + 390435.

It is an arithmetic number, because the mean of its divisors is an integer number (390435).

2⁷⁸⁰⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

780869 is a deficient number, since it is larger than the sum of its proper divisors (1).

780869 is an equidigital number, since it uses as much as digits as its factorization.

780869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 780869 is about 883.6679240529. The cubic root of 780869 is about 92.0858131275.

The spelling of 780869 in words is "seven hundred eighty thousand, eight hundred sixty-nine".