840641840 has 40 divisors (see below), whose sum is σ = 2069465760. Its totient is φ = 316476416.

The previous prime is 840641827. The next prime is 840641863. The reversal of 840641840 is 48146048.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 840641840.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 307700 + ... + 310419.

It is an arithmetic number, because the mean of its divisors is an integer number (51736644).

Almost surely, 2^840641840 is an apocalyptic number.

840641840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

840641840 is an abundant number, since it is smaller than the sum of its proper divisors (1228823920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

840641840 is a wasteful number, since it uses less digits than its factorization.

840641840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618149 (or 618143 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 35.

The square root of 840641840 is about 28993.8241699849. The cubic root of 840641840 is about 943.7790527144.

Adding to 840641840 its reverse (48146048), we get a palindrome (888787888).

The spelling of 840641840 in words is "eight hundred forty million, six hundred forty-one thousand, eight hundred forty".