1944694871388 has 144 divisors (see below), whose sum is σ = 5479945380000. Its totient is φ = 577875492864.

The previous prime is 1944694871387. The next prime is 1944694871393. The reversal of 1944694871388 is 8831784964491.

1944694871388 is a `hidden beast` number, since 1 + 9 + 4 + 4 + 6 + 9 + 487 + 138 + 8 = 666.

It is a super-2 number, since 2×1944694871388² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1944694871387) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 72417388 + ... + 72444236.

It is an arithmetic number, because the mean of its divisors is an integer number (38055176250).

Almost surely, 2^{1944694871388} is an apocalyptic number.

1944694871388 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1944694871388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2739972690000).

1944694871388 is an abundant number, since it is smaller than the sum of its proper divisors (3535250508612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1944694871388 is a wasteful number, since it uses less digits than its factorization.

1944694871388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33124 (or 33119 counting only the distinct ones).

The product of its digits is 334430208, while the sum is 72.

The spelling of 1944694871388 in words is "one trillion, nine hundred forty-four billion, six hundred ninety-four million, eight hundred seventy-one thousand, three hundred eighty-eight".