1944000001 has 4 divisors (see below), whose sum is σ = 1970630212. Its totient is φ = 1917369792.

The previous prime is 1943999999. The next prime is 1944000011. The reversal of 1944000001 is 1000004491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1000004491 = 397 ⋅2518903.

It can be written as a sum of positive squares in 2 ways, for example, as 1313990001 + 630010000 = 36249^2 + 25100^2 .

It is a cyclic number.

It is not a de Polignac number, because 1944000001 - 2¹ = 1943999999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1944000011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13314996 + ... + 13315141.

It is an arithmetic number, because the mean of its divisors is an integer number (492657553).

Almost surely, 2^1944000001 is an apocalyptic number.

It is an amenable number.

1944000001 is a deficient number, since it is larger than the sum of its proper divisors (26630211).

1944000001 is an equidigital number, since it uses as much as digits as its factorization.

1944000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26630210.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 1944000001 is about 44090.8153814374. The cubic root of 1944000001 is about 1248.0502940451.

Adding to 1944000001 its reverse (1000004491), we get a palindrome (2944004492).

The spelling of 1944000001 in words is "one billion, nine hundred forty-four million, one", and thus it is an aban number.