3943399321 has 4 divisors (see below), whose sum is σ = 3943589044. Its totient is φ = 3943209600.

The previous prime is 3943399303. The next prime is 3943399349. The reversal of 3943399321 is 1239933493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1239933493 = 89 ⋅13931837.

It can be written as a sum of positive squares in 2 ways, for example, as 3124810000 + 818589321 = 55900^2 + 28611^2 .

It is a cyclic number.

It is not a de Polignac number, because 3943399321 - 2¹³ = 3943391129 is a prime.

It is a super-2 number, since 2×3943399321² = 31100796409726522082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3943399021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59220 + ... + 106741.

It is an arithmetic number, because the mean of its divisors is an integer number (985897261).

Almost surely, 2^3943399321 is an apocalyptic number.

It is an amenable number.

3943399321 is a deficient number, since it is larger than the sum of its proper divisors (189723).

3943399321 is a wasteful number, since it uses less digits than its factorization.

3943399321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189722.

The product of its digits is 472392, while the sum is 46.

The square root of 3943399321 is about 62796.4913112190. The cubic root of 3943399321 is about 1579.8781245788.

The spelling of 3943399321 in words is "three billion, nine hundred forty-three million, three hundred ninety-nine thousand, three hundred twenty-one".