1881449856 has 512 divisors, whose sum is σ = 6744729600. Its totient is φ = 515082240.

The previous prime is 1881449851. The next prime is 1881449897. The reversal of 1881449856 is 6589441881.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881449851) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 40030825 + ... + 40030871.

It is an arithmetic number, because the mean of its divisors is an integer number (13173300).

Almost surely, 2^1881449856 is an apocalyptic number.

1881449856 is a gapful number since it is divisible by the number (16) 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 1881449856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3372364800).

1881449856 is an abundant number, since it is smaller than the sum of its proper divisors (4863279744).

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

1881449856 is an equidigital number, since it uses as much as digits as its factorization.

1881449856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106 (or 76 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 54.

The square root of 1881449856 is about 43375.6827727242. The cubic root of 1881449856 is about 1234.5183490080.

The spelling of 1881449856 in words is "one billion, eight hundred eighty-one million, four hundred forty-nine thousand, eight hundred fifty-six".