406604665 has 4 divisors (see below), whose sum is σ = 487925604. Its totient is φ = 325283728.

The previous prime is 406604663. The next prime is 406604669. The reversal of 406604665 is 566406604.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 127848249 + 278756416 = 11307^2 + 16696^2 .

It is a cyclic number.

It is not a de Polignac number, because 406604665 - 2¹ = 406604663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406604663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40660462 + ... + 40660471.

It is an arithmetic number, because the mean of its divisors is an integer number (121981401).

Almost surely, 2^406604665 is an apocalyptic number.

It is an amenable number.

406604665 is a deficient number, since it is larger than the sum of its proper divisors (81320939).

406604665 is an equidigital number, since it uses as much as digits as its factorization.

406604665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81320938.

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 406604665 is about 20164.4406071679. The cubic root of 406604665 is about 740.8394813186.

The spelling of 406604665 in words is "four hundred six million, six hundred four thousand, six hundred sixty-five".