1881438320 has 20 divisors (see below), whose sum is σ = 4374344280. Its totient is φ = 752575296.

The previous prime is 1881438283. The next prime is 1881438359. The reversal of 1881438320 is 238341881.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11758910 + ... + 11759069.

It is an arithmetic number, because the mean of its divisors is an integer number (218717214).

Almost surely, 2^1881438320 is an apocalyptic number.

1881438320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1881438320 is an abundant number, since it is smaller than the sum of its proper divisors (2492905960).

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

1881438320 is a wasteful number, since it uses less digits than its factorization.

1881438320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23517992 (or 23517986 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 1881438320 is about 43375.5497947865. The cubic root of 1881438320 is about 1234.5158258772.

The spelling of 1881438320 in words is "one billion, eight hundred eighty-one million, four hundred thirty-eight thousand, three hundred twenty".