444897981 has 32 divisors (see below), whose sum is σ = 722304000. Its totient is φ = 268406640.

The previous prime is 444897979. The next prime is 444897983. The reversal of 444897981 is 189798444.

It is an interprime number because it is at equal distance from previous prime (444897979) and next prime (444897983).

It is not a de Polignac number, because 444897981 - 2¹ = 444897979 is a prime.

It is a super-2 number, since 2×444897981² = 395868426995752722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (444897983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64120 + ... + 70718.

It is an arithmetic number, because the mean of its divisors is an integer number (22572000).

Almost surely, 2^444897981 is an apocalyptic number.

It is an amenable number.

444897981 is a deficient number, since it is larger than the sum of its proper divisors (277406019).

444897981 is a wasteful number, since it uses less digits than its factorization.

444897981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6846 (or 6840 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The square root of 444897981 is about 21092.6048889178. The cubic root of 444897981 is about 763.4023249978.

The spelling of 444897981 in words is "four hundred forty-four million, eight hundred ninety-seven thousand, nine hundred eighty-one".