406556660 has 24 divisors (see below), whose sum is σ = 854667240. Its totient is φ = 162451584.

The previous prime is 406556653. The next prime is 406556663. The reversal of 406556660 is 66655604.

It can be written as a sum of positive squares in 4 ways, for example, as 213568996 + 192987664 = 14614^2 + 13892^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406556663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9746 + ... + 30134.

It is an arithmetic number, because the mean of its divisors is an integer number (35611135).

Almost surely, 2^406556660 is an apocalyptic number.

It is an amenable number.

406556660 is an abundant number, since it is smaller than the sum of its proper divisors (448110580).

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

406556660 is a wasteful number, since it uses less digits than its factorization.

406556660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21395 (or 21393 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 38.

The square root of 406556660 is about 20163.2502340273. The cubic root of 406556660 is about 740.8103249070.

The spelling of 406556660 in words is "four hundred six million, five hundred fifty-six thousand, six hundred sixty".