840012 has 12 divisors (see below), whose sum is σ = 1960056. Its totient is φ = 280000.

The previous prime is 839999. The next prime is 840023. The reversal of 840012 is 210048.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (15) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 839973 and 840000.

It is an unprimeable number.

840012 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34989 + ... + 35012.

It is an arithmetic number, because the mean of its divisors is an integer number (163338).

2⁸⁴⁰⁰¹² is an apocalyptic number.

It is an amenable number.

840012 is an abundant number, since it is smaller than the sum of its proper divisors (1120044).

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

840012 is a wasteful number, since it uses less digits than its factorization.

840012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70008 (or 70006 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 840012 is about 916.5216855045. The cubic root of 840012 is about 94.3543289084.

The spelling of 840012 in words is "eight hundred forty thousand, twelve".