440636221 has 4 divisors (see below), whose sum is σ = 440881344. Its totient is φ = 440391100.

The previous prime is 440636213. The next prime is 440636227. The reversal of 440636221 is 122636044.

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 440636221 - 2³ = 440636213 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 440636221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440636227) 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, 119845 + ... + 123466.

It is an arithmetic number, because the mean of its divisors is an integer number (110220336).

Almost surely, 2^440636221 is an apocalyptic number.

It is an amenable number.

440636221 is a deficient number, since it is larger than the sum of its proper divisors (245123).

440636221 is a wasteful number, since it uses less digits than its factorization.

440636221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245122.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 440636221 is about 20991.3368083121. The cubic root of 440636221 is about 760.9569092705.

The spelling of 440636221 in words is "four hundred forty million, six hundred thirty-six thousand, two hundred twenty-one".