1881912220 has 24 divisors (see below), whose sum is σ = 4016805408. Its totient is φ = 740424000.

The previous prime is 1881912217. The next prime is 1881912269. The reversal of 1881912220 is 222191881.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 770056 + ... + 772495.

It is an arithmetic number, because the mean of its divisors is an integer number (167366892).

Almost surely, 2^1881912220 is an apocalyptic number.

1881912220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1881912220 is an abundant number, since it is smaller than the sum of its proper divisors (2134893188).

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

1881912220 is a wasteful number, since it uses less digits than its factorization.

1881912220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1542621 (or 1542619 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 34.

The square root of 1881912220 is about 43381.0122058027. The cubic root of 1881912220 is about 1234.6194678498.

The spelling of 1881912220 in words is "one billion, eight hundred eighty-one million, nine hundred twelve thousand, two hundred twenty".