406670221 has 4 divisors (see below), whose sum is σ = 416127712. Its totient is φ = 397212732.

The previous prime is 406670213. The next prime is 406670227. The reversal of 406670221 is 122076604.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 406670221 - 2³ = 406670213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 406670221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406670227) 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, 4728681 + ... + 4728766.

It is an arithmetic number, because the mean of its divisors is an integer number (104031928).

Almost surely, 2^406670221 is an apocalyptic number.

It is an amenable number.

406670221 is a deficient number, since it is larger than the sum of its proper divisors (9457491).

406670221 is an equidigital number, since it uses as much as digits as its factorization.

406670221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9457490.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 406670221 is about 20166.0660764563. The cubic root of 406670221 is about 740.8792938338.

The spelling of 406670221 in words is "four hundred six million, six hundred seventy thousand, two hundred twenty-one".