840680 has 16 divisors (see below), whose sum is σ = 1891620. Its totient is φ = 336256.

The previous prime is 840661. The next prime is 840683. The reversal of 840680 is 86048.

It can be written as a sum of positive squares in 2 ways, for example, as 682276 + 158404 = 826^2 + 398^2 .

It is not an unprimeable number, because it can be changed into a prime (840683) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 10469 + ... + 10548.

2⁸⁴⁰⁶⁸⁰ is an apocalyptic number.

It is an amenable number.

840680 is an abundant number, since it is smaller than the sum of its proper divisors (1050940).

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

840680 is a wasteful number, since it uses less digits than its factorization.

840680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21028 (or 21024 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 840680 is about 916.8860343576. The cubic root of 840680 is about 94.3793333098.

The spelling of 840680 in words is "eight hundred forty thousand, six hundred eighty".