840066 has 16 divisors (see below), whose sum is σ = 1768800. Its totient is φ = 265248.

The previous prime is 840061. The next prime is 840067. The reversal of 840066 is 660048.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 840066.

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 7 ways as a sum of consecutive naturals, for example, 3571 + ... + 3798.

It is an arithmetic number, because the mean of its divisors is an integer number (110550).

2⁸⁴⁰⁰⁶⁶ is an apocalyptic number.

840066 is an abundant number, since it is smaller than the sum of its proper divisors (928734).

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

840066 is a wasteful number, since it uses less digits than its factorization.

840066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7393.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 840066 is about 916.5511442358. The cubic root of 840066 is about 94.3563507146.

The spelling of 840066 in words is "eight hundred forty thousand, sixty-six".