444315721 has 4 divisors (see below), whose sum is σ = 456324292. Its totient is φ = 432307152.

The previous prime is 444315709. The next prime is 444315737. The reversal of 444315721 is 127513444.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 269124025 + 175191696 = 16405^2 + 13236^2 .

It is a cyclic number.

It is not a de Polignac number, because 444315721 - 2¹⁵ = 444282953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (444315701) 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, 6004230 + ... + 6004303.

It is an arithmetic number, because the mean of its divisors is an integer number (114081073).

Almost surely, 2^444315721 is an apocalyptic number.

It is an amenable number.

444315721 is a deficient number, since it is larger than the sum of its proper divisors (12008571).

444315721 is a wasteful number, since it uses less digits than its factorization.

444315721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12008570.

The product of its digits is 13440, while the sum is 31.

The square root of 444315721 is about 21078.7979021575. The cubic root of 444315721 is about 763.0691454748.

It can be divided in two parts, 4443 and 15721, that added together give a square (20164 = 142²).

The spelling of 444315721 in words is "four hundred forty-four million, three hundred fifteen thousand, seven hundred twenty-one".