1921545792 has 42 divisors (see below), whose sum is σ = 5507765718. Its totient is φ = 640515072.

The previous prime is 1921545781. The next prime is 1921545797. The reversal of 1921545792 is 2975451291.

1921545792 is a `hidden beast` number, since 1 + 9 + 21 + 54 + 579 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1868314176 + 53231616 = 43224^2 + 7296^2 .

It is not an unprimeable number, because it can be changed into a prime (1921545797) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1667433 + ... + 1668584.

It is an arithmetic number, because the mean of its divisors is an integer number (131137279).

Almost surely, 2^1921545792 is an apocalyptic number.

1921545792 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1921545792 is an abundant number, since it is smaller than the sum of its proper divisors (3586219926).

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

1921545792 is a wasteful number, since it uses less digits than its factorization.

1921545792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3336035 (or 3336022 counting only the distinct ones).

The product of its digits is 226800, while the sum is 45.

The square root of 1921545792 is about 43835.4399088226. The cubic root of 1921545792 is about 1243.2264639596.

The spelling of 1921545792 in words is "one billion, nine hundred twenty-one million, five hundred forty-five thousand, seven hundred ninety-two".