840980 has 24 divisors (see below), whose sum is σ = 2018688. Its totient is φ = 288288.

The previous prime is 840979. The next prime is 840989. The reversal of 840980 is 89048.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2864 + ... + 3143.

It is an arithmetic number, because the mean of its divisors is an integer number (84112).

2⁸⁴⁰⁹⁸⁰ is an apocalyptic number.

It is an amenable number.

840980 is an abundant number, since it is smaller than the sum of its proper divisors (1177708).

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

840980 is a wasteful number, since it uses less digits than its factorization.

840980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6023 (or 6021 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 840980 is about 917.0496169783. The cubic root of 840980 is about 94.3905585214.

The spelling of 840980 in words is "eight hundred forty thousand, nine hundred eighty".