1944538781829 has 16 divisors (see below), whose sum is σ = 2963863314048. Its totient is φ = 1110881293632.

The previous prime is 1944538781819. The next prime is 1944538781851. The reversal of 1944538781829 is 9281878354491.

It is not a de Polignac number, because 1944538781829 - 2¹⁷ = 1944538650757 is a prime.

It is a super-2 number, since 2×1944538781829² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1944538781819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11737642 + ... + 11902155.

It is an arithmetic number, because the mean of its divisors is an integer number (185241457128).

Almost surely, 2^{1944538781829} is an apocalyptic number.

It is an amenable number.

1944538781829 is a deficient number, since it is larger than the sum of its proper divisors (1019324532219).

1944538781829 is a wasteful number, since it uses less digits than its factorization.

1944538781829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23643724.

The product of its digits is 139345920, while the sum is 69.

The spelling of 1944538781829 in words is "one trillion, nine hundred forty-four billion, five hundred thirty-eight million, seven hundred eighty-one thousand, eight hundred twenty-nine".