823780697 has 2 divisors, whose sum is σ = 823780698. Its totient is φ = 823780696.

The previous prime is 823780693. The next prime is 823780709. The reversal of 823780697 is 796087328.

It is a happy number.

823780697 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 758671936 + 65108761 = 27544^2 + 8069^2 .

It is a cyclic number.

It is not a de Polignac number, because 823780697 - 2² = 823780693 is a prime.

It is a super-2 number, since 2×823780697² = 1357229273499611618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (823780693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411890348 + 411890349.

It is an arithmetic number, because the mean of its divisors is an integer number (411890349).

Almost surely, 2^823780697 is an apocalyptic number.

It is an amenable number.

823780697 is a deficient number, since it is larger than the sum of its proper divisors (1).

823780697 is an equidigital number, since it uses as much as digits as its factorization.

823780697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The square root of 823780697 is about 28701.5800436143. The cubic root of 823780697 is about 937.4264511664.

The spelling of 823780697 in words is "eight hundred twenty-three million, seven hundred eighty thousand, six hundred ninety-seven".