840774241 has 2 divisors, whose sum is σ = 840774242. Its totient is φ = 840774240.

The previous prime is 840774229. The next prime is 840774247. The reversal of 840774241 is 142477048.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 754655841 + 86118400 = 27471^2 + 9280^2 .

It is a cyclic number.

It is not a de Polignac number, because 840774241 - 2²¹ = 838677089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 840774241.

It is not a weakly prime, because it can be changed into another prime (840774247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420387120 + 420387121.

It is an arithmetic number, because the mean of its divisors is an integer number (420387121).

Almost surely, 2^840774241 is an apocalyptic number.

It is an amenable number.

840774241 is a deficient number, since it is larger than the sum of its proper divisors (1).

840774241 is an equidigital number, since it uses as much as digits as its factorization.

840774241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50176, while the sum is 37.

The square root of 840774241 is about 28996.1073421934. The cubic root of 840774241 is about 943.8285984800.

The spelling of 840774241 in words is "eight hundred forty million, seven hundred seventy-four thousand, two hundred forty-one".