408173221 has 4 divisors (see below), whose sum is σ = 411988032. Its totient is φ = 404358412.

The previous prime is 408173209. The next prime is 408173261. The reversal of 408173221 is 122371804.

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 408173221 - 2⁷ = 408173093 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 408173221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (408173261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1907245 + ... + 1907458.

It is an arithmetic number, because the mean of its divisors is an integer number (102997008).

Almost surely, 2^408173221 is an apocalyptic number.

It is an amenable number.

408173221 is a deficient number, since it is larger than the sum of its proper divisors (3814811).

408173221 is a wasteful number, since it uses less digits than its factorization.

408173221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3814810.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 408173221 is about 20203.2972803946. The cubic root of 408173221 is about 741.7909027135.

The spelling of 408173221 in words is "four hundred eight million, one hundred seventy-three thousand, two hundred twenty-one".