840081 has 8 divisors (see below), whose sum is σ = 1221984. Its totient is φ = 509120.

The previous prime is 840067. The next prime is 840083. The reversal of 840081 is 180048.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 840081 - 2¹³ = 831889 is a prime.

It is a super-2 number, since 2×840081² = 1411472173122, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 840081.

It is not an unprimeable number, because it can be changed into a prime (840083) 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, 12696 + ... + 12761.

It is an arithmetic number, because the mean of its divisors is an integer number (152748).

2⁸⁴⁰⁰⁸¹ is an apocalyptic number.

It is an amenable number.

840081 is a deficient number, since it is larger than the sum of its proper divisors (381903).

840081 is a wasteful number, since it uses less digits than its factorization.

840081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25471.

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 840081 is about 916.5593270487. The cubic root of 840081 is about 94.3569123121.

The spelling of 840081 in words is "eight hundred forty thousand, eighty-one".