1921193008 has 80 divisors (see below), whose sum is σ = 4426891264. Its totient is φ = 790352640.

The previous prime is 1921193003. The next prime is 1921193011. The reversal of 1921193008 is 8003911291.

It is not an unprimeable number, because it can be changed into a prime (1921193003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 438766 + ... + 443122.

Almost surely, 2^1921193008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1921193008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2213445632).

1921193008 is an abundant number, since it is smaller than the sum of its proper divisors (2505698256).

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

1921193008 is a wasteful number, since it uses less digits than its factorization.

1921193008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4530 (or 4524 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1921193008 is about 43831.4157654074. The cubic root of 1921193008 is about 1243.1503763899.

The spelling of 1921193008 in words is "one billion, nine hundred twenty-one million, one hundred ninety-three thousand, eight".