440431221 has 4 divisors (see below), whose sum is σ = 587241632. Its totient is φ = 293620812.

The previous prime is 440431217. The next prime is 440431237. The reversal of 440431221 is 122134044.

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 not a de Polignac number, because 440431221 - 2² = 440431217 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 (440431261) 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, 73405201 + ... + 73405206.

It is an arithmetic number, because the mean of its divisors is an integer number (146810408).

Almost surely, 2^440431221 is an apocalyptic number.

It is an amenable number.

440431221 is a deficient number, since it is larger than the sum of its proper divisors (146810411).

440431221 is a wasteful number, since it uses less digits than its factorization.

440431221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146810410.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 440431221 is about 20986.4532734810. The cubic root of 440431221 is about 760.8388826862.

Adding to 440431221 its reverse (122134044), we get a palindrome (562565265).

The spelling of 440431221 in words is "four hundred forty million, four hundred thirty-one thousand, two hundred twenty-one".