840071 has 4 divisors (see below), whose sum is σ = 849600. Its totient is φ = 830544.

The previous prime is 840067. The next prime is 840083. The reversal of 840071 is 170048.

It is a happy number.

840071 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.

It is a cyclic number.

It is not a de Polignac number, because 840071 - 2² = 840067 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 840071.

It is not an unprimeable number, because it can be changed into a prime (840061) 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, 4631 + ... + 4808.

It is an arithmetic number, because the mean of its divisors is an integer number (212400).

2⁸⁴⁰⁰⁷¹ is an apocalyptic number.

840071 is a deficient number, since it is larger than the sum of its proper divisors (9529).

840071 is an equidigital number, since it uses as much as digits as its factorization.

840071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9528.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 840071 is about 916.5538718482. The cubic root of 840071 is about 94.3565379146.

The spelling of 840071 in words is "eight hundred forty thousand, seventy-one".