840120012 has 84 divisors (see below), whose sum is σ = 2258391576. Its totient is φ = 273170880.

The previous prime is 840119983. The next prime is 840120097. The reversal of 840120012 is 210021048.

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

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 116043 + ... + 123069.

It is an arithmetic number, because the mean of its divisors is an integer number (26885614).

Almost surely, 2^840120012 is an apocalyptic number.

840120012 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 840120012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1129195788).

840120012 is an abundant number, since it is smaller than the sum of its proper divisors (1418271564).

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

840120012 is a wasteful number, since it uses less digits than its factorization.

840120012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7090 (or 7073 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 840120012 is about 28984.8238221315. The cubic root of 840120012 is about 943.5837288354.

The spelling of 840120012 in words is "eight hundred forty million, one hundred twenty thousand, twelve".