444355221 has 4 divisors (see below), whose sum is σ = 592473632. Its totient is φ = 296236812.

The previous prime is 444355217. The next prime is 444355279. The reversal of 444355221 is 122553444.

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 444355221 - 2² = 444355217 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 (444355291) 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, 74059201 + ... + 74059206.

It is an arithmetic number, because the mean of its divisors is an integer number (148118408).

Almost surely, 2^444355221 is an apocalyptic number.

It is an amenable number.

444355221 is a deficient number, since it is larger than the sum of its proper divisors (148118411).

444355221 is a wasteful number, since it uses less digits than its factorization.

444355221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148118410.

The product of its digits is 19200, while the sum is 30.

The square root of 444355221 is about 21079.7348417858. The cubic root of 444355221 is about 763.0917572774.

The spelling of 444355221 in words is "four hundred forty-four million, three hundred fifty-five thousand, two hundred twenty-one".