444972821 has 8 divisors (see below), whose sum is σ = 449679360. Its totient is φ = 440285328.

The previous prime is 444972811. The next prime is 444972823. The reversal of 444972821 is 128279444.

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 444972821 - 2¹⁰ = 444971797 is a prime.

It is a super-2 number, since 2×444972821² = 396001622857396082, which contains 22 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 (444972823) 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, 44900 + ... + 53906.

It is an arithmetic number, because the mean of its divisors is an integer number (56209920).

Almost surely, 2^444972821 is an apocalyptic number.

It is an amenable number.

444972821 is a deficient number, since it is larger than the sum of its proper divisors (4706539).

444972821 is a wasteful number, since it uses less digits than its factorization.

444972821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9523.

The product of its digits is 129024, while the sum is 41.

The square root of 444972821 is about 21094.3788958101. The cubic root of 444972821 is about 763.4451286885.

The spelling of 444972821 in words is "four hundred forty-four million, nine hundred seventy-two thousand, eight hundred twenty-one".