780309823 has 2 divisors, whose sum is σ = 780309824. Its totient is φ = 780309822.

The previous prime is 780309793. The next prime is 780309853. The reversal of 780309823 is 328903087.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (780309793) and next prime (780309853).

It is a cyclic number.

It is not a de Polignac number, because 780309823 - 2⁵ = 780309791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (780309853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390154911 + 390154912.

It is an arithmetic number, because the mean of its divisors is an integer number (390154912).

Almost surely, 2^780309823 is an apocalyptic number.

780309823 is a deficient number, since it is larger than the sum of its proper divisors (1).

780309823 is an equidigital number, since it uses as much as digits as its factorization.

780309823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 780309823 is about 27934.0262583108. The cubic root of 780309823 is about 920.6382712441.

The spelling of 780309823 in words is "seven hundred eighty million, three hundred nine thousand, eight hundred twenty-three".