666834 has 16 divisors (see below), whose sum is σ = 1524288. Its totient is φ = 190512.

The previous prime is 666829. The next prime is 666857. The reversal of 666834 is 438666.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 666795 and 666804.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7897 + ... + 7980.

It is an arithmetic number, because the mean of its divisors is an integer number (95268).

2⁶⁶⁶⁸³⁴ is an apocalyptic number.

666834 is an abundant number, since it is smaller than the sum of its proper divisors (857454).

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

666834 is a wasteful number, since it uses less digits than its factorization.

666834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15889.

The product of its digits is 20736, while the sum is 33.

The square root of 666834 is about 816.5990448194. The cubic root of 666834 is about 87.3653548188.

The spelling of 666834 in words is "six hundred sixty-six thousand, eight hundred thirty-four".