666340 has 12 divisors (see below), whose sum is σ = 1399356. Its totient is φ = 266528.

The previous prime is 666329. The next prime is 666353. The reversal of 666340 is 43666.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 222784 + 443556 = 472^2 + 666^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16639 + ... + 16678.

It is an arithmetic number, because the mean of its divisors is an integer number (116613).

2⁶⁶⁶³⁴⁰ is an apocalyptic number.

It is an amenable number.

666340 is an abundant number, since it is smaller than the sum of its proper divisors (733016).

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

666340 is a wasteful number, since it uses less digits than its factorization.

666340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33326 (or 33324 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 666340 is about 816.2965147543. The cubic root of 666340 is about 87.3437756616.

The spelling of 666340 in words is "six hundred sixty-six thousand, three hundred forty".