1881444240 has 160 divisors (see below), whose sum is σ = 6979136640. Its totient is φ = 463117824.

The previous prime is 1881444193. The next prime is 1881444259. The reversal of 1881444240 is 424441881.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1881444195 and 1881444204.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5422 + ... + 61581.

It is an arithmetic number, because the mean of its divisors is an integer number (43619604).

Almost surely, 2^1881444240 is an apocalyptic number.

1881444240 is a gapful number since it is divisible by the number (10) 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 1881444240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3489568320).

1881444240 is an abundant number, since it is smaller than the sum of its proper divisors (5097692400).

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

1881444240 is a wasteful number, since it uses less digits than its factorization.

1881444240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67038 (or 67026 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 36.

The square root of 1881444240 is about 43375.6180359427. The cubic root of 1881444240 is about 1234.5171206890.

The spelling of 1881444240 in words is "one billion, eight hundred eighty-one million, four hundred forty-four thousand, two hundred forty".