840881 has 4 divisors (see below), whose sum is σ = 843264. Its totient is φ = 838500.

The previous prime is 840863. The next prime is 840907. The reversal of 840881 is 188048.

840881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 840881 - 2⁶ = 840817 is a prime.

It is a super-2 number, since 2×840881² = 1414161712322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 545 + ... + 1406.

It is an arithmetic number, because the mean of its divisors is an integer number (210816).

2⁸⁴⁰⁸⁸¹ is an apocalyptic number.

It is an amenable number.

840881 is a deficient number, since it is larger than the sum of its proper divisors (2383).

840881 is a wasteful number, since it uses less digits than its factorization.

840881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2382.

The product of its (nonzero) digits is 2048, while the sum is 29.

The square root of 840881 is about 916.9956379395. The cubic root of 840881 is about 94.3868544967.

The spelling of 840881 in words is "eight hundred forty thousand, eight hundred eighty-one".