840648959 has 2 divisors, whose sum is σ = 840648960. Its totient is φ = 840648958.

The previous prime is 840648899. The next prime is 840648973. The reversal of 840648959 is 959846048.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 840648959 - 2⁸ = 840648703 is a prime.

It is a super-3 number, since 3×840648959³ (a number of 28 digits) contains 333 as substring.

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 840648959.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840648989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420324479 + 420324480.

It is an arithmetic number, because the mean of its divisors is an integer number (420324480).

Almost surely, 2^840648959 is an apocalyptic number.

840648959 is a deficient number, since it is larger than the sum of its proper divisors (1).

840648959 is an equidigital number, since it uses as much as digits as its factorization.

840648959 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2488320, while the sum is 53.

The square root of 840648959 is about 28993.9469372488. The cubic root of 840648959 is about 943.7817168470.

The spelling of 840648959 in words is "eight hundred forty million, six hundred forty-eight thousand, nine hundred fifty-nine".