406660 has 12 divisors (see below), whose sum is σ = 854028. Its totient is φ = 162656.

The previous prime is 406649. The next prime is 406661. The reversal of 406660 is 66604.

It can be written as a sum of positive squares in 2 ways, for example, as 293764 + 112896 = 542^2 + 336^2 .

It is not an unprimeable number, because it can be changed into a prime (406661) by changing a digit.

406660 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10147 + ... + 10186.

It is an arithmetic number, because the mean of its divisors is an integer number (71169).

2⁴⁰⁶⁶⁶⁰ is an apocalyptic number.

It is an amenable number.

406660 is an abundant number, since it is smaller than the sum of its proper divisors (447368).

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

406660 is a wasteful number, since it uses less digits than its factorization.

406660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20342 (or 20340 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 406660 is about 637.6989885518. The cubic root of 406660 is about 74.0873086847.

The spelling of 406660 in words is "four hundred six thousand, six hundred sixty".