840459874 has 8 divisors (see below), whose sum is σ = 1271846700. Its totient is φ = 416510976.

The previous prime is 840459863. The next prime is 840459883. The reversal of 840459874 is 478954048.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 805140625 + 35319249 = 28375^2 + 5943^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1859199 + ... + 1859650.

Almost surely, 2^840459874 is an apocalyptic number.

840459874 is a deficient number, since it is larger than the sum of its proper divisors (431386826).

840459874 is a wasteful number, since it uses less digits than its factorization.

840459874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3718964.

The product of its (nonzero) digits is 1290240, while the sum is 49.

The square root of 840459874 is about 28990.6859870545. The cubic root of 840459874 is about 943.7109507460.

The spelling of 840459874 in words is "eight hundred forty million, four hundred fifty-nine thousand, eight hundred seventy-four".