840671 has 4 divisors (see below), whose sum is σ = 905352. Its totient is φ = 775992.

The previous prime is 840661. The next prime is 840683. The reversal of 840671 is 176048.

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 840671 - 2¹⁴ = 824287 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 840671.

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 840671.

It is not an unprimeable number, because it can be changed into a prime (840601) 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, 32321 + ... + 32346.

It is an arithmetic number, because the mean of its divisors is an integer number (226338).

2⁸⁴⁰⁶⁷¹ is an apocalyptic number.

840671 is a deficient number, since it is larger than the sum of its proper divisors (64681).

840671 is a wasteful number, since it uses less digits than its factorization.

840671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64680.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 840671 is about 916.8811264281. The cubic root of 840671 is about 94.3789965122.

The spelling of 840671 in words is "eight hundred forty thousand, six hundred seventy-one".