406664 has 8 divisors (see below), whose sum is σ = 762510. Its totient is φ = 203328.

The previous prime is 406661. The next prime is 406673. The reversal of 406664 is 466604.

It can be written as a sum of positive squares in only one way, i.e., 348100 + 58564 = 590^2 + 242^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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

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 as a sum of consecutive naturals, namely, 25409 + ... + 25424.

2⁴⁰⁶⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

406664 is a deficient number, since it is larger than the sum of its proper divisors (355846).

406664 is a wasteful number, since it uses less digits than its factorization.

406664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50839 (or 50835 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 406664 is about 637.7021248200. The cubic root of 406664 is about 74.0875515970.

The spelling of 406664 in words is "four hundred six thousand, six hundred sixty-four".