840006 has 24 divisors (see below), whose sum is σ = 1900080. Its totient is φ = 267696.

The previous prime is 839999. The next prime is 840023. The reversal of 840006 is 600048.

It is a super-2 number, since 2×840006² = 1411220160072, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 601 + ... + 1428.

It is an arithmetic number, because the mean of its divisors is an integer number (79170).

2⁸⁴⁰⁰⁰⁶ is an apocalyptic number.

840006 is an abundant number, since it is smaller than the sum of its proper divisors (1060074).

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

840006 is a wasteful number, since it uses less digits than its factorization.

840006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2060 (or 2057 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 840006 is about 916.5184122537. The cubic root of 840006 is about 94.3541042579.

The spelling of 840006 in words is "eight hundred forty thousand, six".