3721843921 has 8 divisors (see below), whose sum is σ = 3849640704. Its totient is φ = 3595810080.

The previous prime is 3721843889. The next prime is 3721843987. The reversal of 3721843921 is 1293481273.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3721843921 - 2⁵ = 3721843889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3721843721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 436441 + ... + 444886.

It is an arithmetic number, because the mean of its divisors is an integer number (481205088).

Almost surely, 2^3721843921 is an apocalyptic number.

It is an amenable number.

3721843921 is a deficient number, since it is larger than the sum of its proper divisors (127796783).

3721843921 is a wasteful number, since it uses less digits than its factorization.

3721843921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881471.

The product of its digits is 72576, while the sum is 40.

The square root of 3721843921 is about 61006.9169930755. The cubic root of 3721843921 is about 1549.7181479880.

The spelling of 3721843921 in words is "three billion, seven hundred twenty-one million, eight hundred forty-three thousand, nine hundred twenty-one".