444135721 has 8 divisors (see below), whose sum is σ = 450092160. Its totient is φ = 438200928.

The previous prime is 444135689. The next prime is 444135733. The reversal of 444135721 is 127531444.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 444135721 - 2⁵ = 444135689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (444135751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38220 + ... + 48466.

It is an arithmetic number, because the mean of its divisors is an integer number (56261520).

Almost surely, 2^444135721 is an apocalyptic number.

It is an amenable number.

444135721 is a deficient number, since it is larger than the sum of its proper divisors (5956439).

444135721 is a wasteful number, since it uses less digits than its factorization.

444135721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10823.

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

The square root of 444135721 is about 21074.5277764414. The cubic root of 444135721 is about 762.9660873776.

The spelling of 444135721 in words is "four hundred forty-four million, one hundred thirty-five thousand, seven hundred twenty-one".