3944172221 has 8 divisors (see below), whose sum is σ = 4373270688. Its totient is φ = 3526830000.

The previous prime is 3944172217. The next prime is 3944172223. The reversal of 3944172221 is 1222714493.

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 3944172221 - 2² = 3944172217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3944172223) 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, 2938355 + ... + 2939696.

It is an arithmetic number, because the mean of its divisors is an integer number (546658836).

Almost surely, 2^3944172221 is an apocalyptic number.

It is an amenable number.

3944172221 is a deficient number, since it is larger than the sum of its proper divisors (429098467).

3944172221 is a wasteful number, since it uses less digits than its factorization.

3944172221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5878123.

The product of its digits is 24192, while the sum is 35.

The square root of 3944172221 is about 62802.6450159545. The cubic root of 3944172221 is about 1579.9813357033.

The spelling of 3944172221 in words is "three billion, nine hundred forty-four million, one hundred seventy-two thousand, two hundred twenty-one".