840620 has 24 divisors (see below), whose sum is σ = 1926288. Its totient is φ = 305600.

The previous prime is 840611. The next prime is 840643. The reversal of 840620 is 26048.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 840592 and 840601.

It is an unprimeable number.

840620 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1691 + ... + 2130.

It is an arithmetic number, because the mean of its divisors is an integer number (80262).

2⁸⁴⁰⁶²⁰ is an apocalyptic number.

It is an amenable number.

840620 is an abundant number, since it is smaller than the sum of its proper divisors (1085668).

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

840620 is a wasteful number, since it uses less digits than its factorization.

840620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3841 (or 3839 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 840620 is about 916.8533143311. The cubic root of 840620 is about 94.3770879470.

Adding to 840620 its reverse (26048), we get a palindrome (866668).

The spelling of 840620 in words is "eight hundred forty thousand, six hundred twenty".