444943781 has 6 divisors (see below), whose sum is σ = 460404210. Its totient is φ = 429491216.

The previous prime is 444943769. The next prime is 444943799. The reversal of 444943781 is 187349444.

It can be written as a sum of positive squares in 3 ways, for example, as 201895681 + 243048100 = 14209^2 + 15590^2 .

It is not a de Polignac number, because 444943781 - 2¹⁴ = 444927397 is a prime.

It is a super-2 number, since 2×444943781² = 395949936501151922, 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 (444943711) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 111635 + ... + 115551.

It is an arithmetic number, because the mean of its divisors is an integer number (76734035).

Almost surely, 2^444943781 is an apocalyptic number.

It is an amenable number.

444943781 is a deficient number, since it is larger than the sum of its proper divisors (15460429).

444943781 is an frugal number, since it uses more digits than its factorization.

444943781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7863 (or 3946 counting only the distinct ones).

The product of its digits is 387072, while the sum is 44.

The square root of 444943781 is about 21093.6905495459. The cubic root of 444943781 is about 763.4285202368.

The spelling of 444943781 in words is "four hundred forty-four million, nine hundred forty-three thousand, seven hundred eighty-one".