1921051860 has 144 divisors (see below), whose sum is σ = 6738592896. Its totient is φ = 405312768.

The previous prime is 1921051831. The next prime is 1921051871. The reversal of 1921051860 is 681501291.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13089 + ... + 63351.

It is an arithmetic number, because the mean of its divisors is an integer number (46795784).

Almost surely, 2^1921051860 is an apocalyptic number.

1921051860 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 1921051860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3369296448).

1921051860 is an abundant number, since it is smaller than the sum of its proper divisors (4817541036).

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

1921051860 is a wasteful number, since it uses less digits than its factorization.

1921051860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50302 (or 50293 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 33.

The square root of 1921051860 is about 43829.8056121631. The cubic root of 1921051860 is about 1243.1199313338.

The spelling of 1921051860 in words is "one billion, nine hundred twenty-one million, fifty-one thousand, eight hundred sixty".