1944440001 has 36 divisors (see below), whose sum is σ = 3372605184. Its totient is φ = 1075258800.

The previous prime is 1944439999. The next prime is 1944440011. The reversal of 1944440001 is 1000444491.

It is not a de Polignac number, because 1944440001 - 2¹ = 1944439999 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1944440011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 57445 + ... + 84786.

Almost surely, 2^1944440001 is an apocalyptic number.

It is an amenable number.

1944440001 is a deficient number, since it is larger than the sum of its proper divisors (1428165183).

1944440001 is a wasteful number, since it uses less digits than its factorization.

1944440001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142282 (or 142272 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 1944440001 is about 44095.8048004569. The cubic root of 1944440001 is about 1248.1444471151.

Adding to 1944440001 its reverse (1000444491), we get a palindrome (2944884492).

The spelling of 1944440001 in words is "one billion, nine hundred forty-four million, four hundred forty thousand, one".