840648 has 16 divisors (see below), whose sum is σ = 2101680. Its totient is φ = 280208.

The previous prime is 840643. The next prime is 840661. The reversal of 840648 is 846048.

840648 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×840648³ = 1782230234490533376, which contains 333 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 840648.

It is not an unprimeable number, because it can be changed into a prime (840643) by changing a digit.

840648 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, 17490 + ... + 17537.

It is an arithmetic number, because the mean of its divisors is an integer number (131355).

2⁸⁴⁰⁶⁴⁸ is an apocalyptic number.

It is an amenable number.

840648 is an abundant number, since it is smaller than the sum of its proper divisors (1261032).

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

840648 is a wasteful number, since it uses less digits than its factorization.

840648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35036 (or 35032 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 840648 is about 916.8685838221. The cubic root of 840648 is about 94.3781357963.

The spelling of 840648 in words is "eight hundred forty thousand, six hundred forty-eight".