405560221 has 4 divisors (see below), whose sum is σ = 442429344. Its totient is φ = 368691100.

The previous prime is 405560213. The next prime is 405560231. The reversal of 405560221 is 122065504.

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 405560221 - 2³ = 405560213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405560231) 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, 18434545 + ... + 18434566.

It is an arithmetic number, because the mean of its divisors is an integer number (110607336).

Almost surely, 2^405560221 is an apocalyptic number.

It is an amenable number.

405560221 is a deficient number, since it is larger than the sum of its proper divisors (36869123).

405560221 is a wasteful number, since it uses less digits than its factorization.

405560221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36869122.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 405560221 is about 20138.5257901367. The cubic root of 405560221 is about 740.2046068015.

The spelling of 405560221 in words is "four hundred five million, five hundred sixty thousand, two hundred twenty-one".