1881349385944 has 64 divisors (see below), whose sum is σ = 4041405264960. Its totient is φ = 804306370560.

The previous prime is 1881349385941. The next prime is 1881349385959. The reversal of 1881349385944 is 4495839431881.

It is a super-2 number, since 2×1881349385944² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1881349385944.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881349385941) 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, 42027414 + ... + 42072154.

It is an arithmetic number, because the mean of its divisors is an integer number (63146957265).

Almost surely, 2^{1881349385944} is an apocalyptic number.

1881349385944 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1881349385944 is an abundant number, since it is smaller than the sum of its proper divisors (2160055879016).

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

1881349385944 is a wasteful number, since it uses less digits than its factorization.

1881349385944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46588 (or 46584 counting only the distinct ones).

The product of its digits is 119439360, while the sum is 67.

The spelling of 1881349385944 in words is "one trillion, eight hundred eighty-one billion, three hundred forty-nine million, three hundred eighty-five thousand, nine hundred forty-four".