840546 has 36 divisors (see below), whose sum is σ = 2120742. Its totient is φ = 239904.

The previous prime is 840523. The next prime is 840547. The reversal of 840546 is 645048.

840546 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 741321 + 99225 = 861^2 + 315^2 .

It is not an unprimeable number, because it can be changed into a prime (840547) by changing a digit.

840546 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 406 + ... + 1358.

2⁸⁴⁰⁵⁴⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 840546, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1060371).

840546 is an abundant number, since it is smaller than the sum of its proper divisors (1280196).

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

840546 is a wasteful number, since it uses less digits than its factorization.

840546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 975 (or 965 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 840546 is about 916.8129580236. The cubic root of 840546 is about 94.3743185191.

The spelling of 840546 in words is "eight hundred forty thousand, five hundred forty-six".