840459168 has 36 divisors (see below), whose sum is σ = 2390056578. Its totient is φ = 280152960.

The previous prime is 840459161. The next prime is 840459173. The reversal of 840459168 is 861954048.

It can be written as a sum of positive squares in only one way, i.e., 472279824 + 368179344 = 21732^2 + 19188^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×840459168² = 1412743226150504448, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (840459161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1458843 + ... + 1459418.

Almost surely, 2^840459168 is an apocalyptic number.

It is an amenable number.

840459168 is an abundant number, since it is smaller than the sum of its proper divisors (1549597410).

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

840459168 is a wasteful number, since it uses less digits than its factorization.

840459168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2918277 (or 2918266 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 840459168 is about 28990.6738107275. The cubic root of 840459168 is about 943.7106865018.

The spelling of 840459168 in words is "eight hundred forty million, four hundred fifty-nine thousand, one hundred sixty-eight".