840618961 has 24 divisors (see below), whose sum is σ = 1070979840. Its totient is φ = 653802912.

The previous prime is 840618953. The next prime is 840618967. The reversal of 840618961 is 169816048.

840618961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 840618961 - 2³ = 840618953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (840618967) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26400 + ... + 48766.

It is an arithmetic number, because the mean of its divisors is an integer number (44624160).

Almost surely, 2^840618961 is an apocalyptic number.

It is an amenable number.

840618961 is a deficient number, since it is larger than the sum of its proper divisors (230360879).

840618961 is a wasteful number, since it uses less digits than its factorization.

840618961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22453 (or 22446 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 840618961 is about 28993.4296177600. The cubic root of 840618961 is about 943.7704906388.

The spelling of 840618961 in words is "eight hundred forty million, six hundred eighteen thousand, nine hundred sixty-one".