4084993921 has 4 divisors (see below), whose sum is σ = 4162069332. Its totient is φ = 4007918512.

The previous prime is 4084993889. The next prime is 4084993949. The reversal of 4084993921 is 1293994804.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2637952321 + 1447041600 = 51361^2 + 38040^2 .

It is not a de Polignac number, because 4084993921 - 2⁵ = 4084993889 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4084993951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38537626 + ... + 38537731.

It is an arithmetic number, because the mean of its divisors is an integer number (1040517333).

Almost surely, 2^4084993921 is an apocalyptic number.

It is an amenable number.

4084993921 is a deficient number, since it is larger than the sum of its proper divisors (77075411).

4084993921 is an equidigital number, since it uses as much as digits as its factorization.

4084993921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77075410.

The product of its (nonzero) digits is 559872, while the sum is 49.

The square root of 4084993921 is about 63913.9571689940. The cubic root of 4084993921 is about 1598.5656312976.

The spelling of 4084993921 in words is "four billion, eighty-four million, nine hundred ninety-three thousand, nine hundred twenty-one".