840630 has 32 divisors (see below), whose sum is σ = 2306304. Its totient is φ = 192096.

The previous prime is 840611. The next prime is 840643. The reversal of 840630 is 36048.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 840597 and 840606.

It is a congruent number.

It is an unprimeable number.

840630 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 15 ways as a sum of consecutive naturals, for example, 1792 + ... + 2211.

It is an arithmetic number, because the mean of its divisors is an integer number (72072).

2⁸⁴⁰⁶³⁰ is an apocalyptic number.

840630 is an abundant number, since it is smaller than the sum of its proper divisors (1465674).

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

840630 is a wasteful number, since it uses less digits than its factorization.

840630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4020.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 840630 is about 916.8587677500. The cubic root of 840630 is about 94.3774621816.

Adding to 840630 its reverse (36048), we get a palindrome (876678).

The spelling of 840630 in words is "eight hundred forty thousand, six hundred thirty".