840432 has 20 divisors (see below), whose sum is σ = 2171240. Its totient is φ = 280128.

The previous prime is 840353. The next prime is 840439. The reversal of 840432 is 234048.

It is a happy number.

840432 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 840399 and 840408.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 840432.

It is not an unprimeable number, because it can be changed into a prime (840439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8707 + ... + 8802.

It is an arithmetic number, because the mean of its divisors is an integer number (108562).

2⁸⁴⁰⁴³² is an apocalyptic number.

It is an amenable number.

840432 is an abundant number, since it is smaller than the sum of its proper divisors (1330808).

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

840432 is a wasteful number, since it uses less digits than its factorization.

840432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17520 (or 17514 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 840432 is about 916.7507840193. The cubic root of 840432 is about 94.3700517851.

The spelling of 840432 in words is "eight hundred forty thousand, four hundred thirty-two".