840824797 has 2 divisors, whose sum is σ = 840824798. Its totient is φ = 840824796.

The previous prime is 840824717. The next prime is 840824849. The reversal of 840824797 is 797428048.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 816873561 + 23951236 = 28581^2 + 4894^2 .

It is a cyclic number.

It is not a de Polignac number, because 840824797 - 2⁷ = 840824669 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 840824797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840824717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420412398 + 420412399.

It is an arithmetic number, because the mean of its divisors is an integer number (420412399).

Almost surely, 2^840824797 is an apocalyptic number.

It is an amenable number.

840824797 is a deficient number, since it is larger than the sum of its proper divisors (1).

840824797 is an equidigital number, since it uses as much as digits as its factorization.

840824797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 903168, while the sum is 49.

The square root of 840824797 is about 28996.9791012788. The cubic root of 840824797 is about 943.8475156637.

The spelling of 840824797 in words is "eight hundred forty million, eight hundred twenty-four thousand, seven hundred ninety-seven".