1921340120 has 64 divisors (see below), whose sum is σ = 4961433600. Its totient is φ = 655966080.

The previous prime is 1921340111. The next prime is 1921340123. The reversal of 1921340120 is 210431291.

It is a super-2 number, since 2×1921340120² = 7383095713443228800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921340123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52565 + ... + 81275.

It is an arithmetic number, because the mean of its divisors is an integer number (77522400).

Almost surely, 2^1921340120 is an apocalyptic number.

1921340120 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 1921340120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2480716800).

1921340120 is an abundant number, since it is smaller than the sum of its proper divisors (3040093480).

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

1921340120 is a wasteful number, since it uses less digits than its factorization.

1921340120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28968 (or 28964 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1921340120 is about 43833.0938903473. The cubic root of 1921340120 is about 1243.1821062698.

The spelling of 1921340120 in words is "one billion, nine hundred twenty-one million, three hundred forty thousand, one hundred twenty".