840484 has 12 divisors (see below), whose sum is σ = 1548400. Its totient is φ = 398088.

The previous prime is 840479. The next prime is 840491. The reversal of 840484 is 484048.

It is a happy number.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

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, 5454 + ... + 5605.

2⁸⁴⁰⁴⁸⁴ is an apocalyptic number.

It is an amenable number.

840484 is a deficient number, since it is larger than the sum of its proper divisors (707916).

840484 is a wasteful number, since it uses less digits than its factorization.

840484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11082 (or 11080 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 28.

The square root of 840484 is about 916.7791446144. The cubic root of 840484 is about 94.3719980625.

Subtracting from 840484 its sum of digits (28), we obtain a triangular number (840456 = T₁₂₉₆).

The spelling of 840484 in words is "eight hundred forty thousand, four hundred eighty-four".