840920 has 16 divisors (see below), whose sum is σ = 1892160. Its totient is φ = 336352.

The previous prime is 840911. The next prime is 840923. The reversal of 840920 is 29048.

840920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840923) by changing a digit.

840920 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 3 ways as a sum of consecutive naturals, for example, 10472 + ... + 10551.

It is an arithmetic number, because the mean of its divisors is an integer number (118260).

2⁸⁴⁰⁹²⁰ is an apocalyptic number.

It is an amenable number.

840920 is an abundant number, since it is smaller than the sum of its proper divisors (1051240).

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

840920 is a wasteful number, since it uses less digits than its factorization.

840920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21034 (or 21030 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 840920 is about 917.0169027886. The cubic root of 840920 is about 94.3883136927.

Adding to 840920 its reverse (29048), we get a palindrome (869968).

The spelling of 840920 in words is "eight hundred forty thousand, nine hundred twenty".