444031621 has 4 divisors (see below), whose sum is σ = 484398144. Its totient is φ = 403665100.

The previous prime is 444031613. The next prime is 444031649. The reversal of 444031621 is 126130444.

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 444031621 - 2³ = 444031613 is a prime.

It is a super-4 number, since 4×444031621⁴ (a number of 36 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (444031921) 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, 20183245 + ... + 20183266.

It is an arithmetic number, because the mean of its divisors is an integer number (121099536).

Almost surely, 2^444031621 is an apocalyptic number.

It is an amenable number.

444031621 is a deficient number, since it is larger than the sum of its proper divisors (40366523).

444031621 is a wasteful number, since it uses less digits than its factorization.

444031621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40366522.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 444031621 is about 21072.0578254712. The cubic root of 444031621 is about 762.9064727357.

The spelling of 444031621 in words is "four hundred forty-four million, thirty-one thousand, six hundred twenty-one".