840830 has 16 divisors (see below), whose sum is σ = 1546560. Its totient is φ = 328992.

The previous prime is 840823. The next prime is 840839. The reversal of 840830 is 38048.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 840796 and 840805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840839) by changing a digit.

840830 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 7 ways as a sum of consecutive naturals, for example, 425 + ... + 1364.

It is an arithmetic number, because the mean of its divisors is an integer number (96660).

2⁸⁴⁰⁸³⁰ is an apocalyptic number.

840830 is a deficient number, since it is larger than the sum of its proper divisors (705730).

840830 is a wasteful number, since it uses less digits than its factorization.

840830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1843.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 840830 is about 916.9678293157. The cubic root of 840830 is about 94.3849462494.

Adding to 840830 its reverse (38048), we get a palindrome (878878).

The spelling of 840830 in words is "eight hundred forty thousand, eight hundred thirty".