444725721 has 56 divisors (see below), whose sum is σ = 751284480. Its totient is φ = 260690400.

The previous prime is 444725719. The next prime is 444725747. The reversal of 444725721 is 127527444.

444725721 is a `hidden beast` number, since 44 + 47 + 2 + 572 + 1 = 666.

It is not a de Polignac number, because 444725721 - 2¹ = 444725719 is a prime.

It is a super-3 number, since 3×444725721³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (444725711) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 247695 + ... + 249483.

Almost surely, 2^444725721 is an apocalyptic number.

It is an amenable number.

444725721 is a deficient number, since it is larger than the sum of its proper divisors (306558759).

444725721 is a wasteful number, since it uses less digits than its factorization.

444725721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1849 (or 1834 counting only the distinct ones).

The product of its digits is 62720, while the sum is 36.

The square root of 444725721 is about 21088.5210719007. The cubic root of 444725721 is about 763.3037850583.

The spelling of 444725721 in words is "four hundred forty-four million, seven hundred twenty-five thousand, seven hundred twenty-one".