840816 has 30 divisors (see below), whose sum is σ = 2353520. Its totient is φ = 280224.

The previous prime is 840767. The next prime is 840817. The reversal of 840816 is 618048.

840816 is an esthetic number in base 7, because in such base its adjacent digits differ by 1.

It is a self number, because there is not a number n which added to its sum of digits gives 840816.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840817) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2776 + ... + 3063.

2⁸⁴⁰⁸¹⁶ is an apocalyptic number.

It is an amenable number.

840816 is an abundant number, since it is smaller than the sum of its proper divisors (1512704).

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

840816 is a wasteful number, since it uses less digits than its factorization.

840816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5853 (or 5844 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 840816 is about 916.9601954284. The cubic root of 840816 is about 94.3844224032.

The spelling of 840816 in words is "eight hundred forty thousand, eight hundred sixteen".