3982372943621 has 4 divisors (see below), whose sum is σ = 3982378729644. Its totient is φ = 3982367157600.

The previous prime is 3982372943551. The next prime is 3982372943651. The reversal of 3982372943621 is 1263492732893.

It is a happy number.

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 971752350625 + 3010620592996 = 985775^2 + 1735114^2 .

It is a cyclic number.

It is not a de Polignac number, because 3982372943621 - 2¹⁴ = 3982372927237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3982372943651) 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, 1695320 + ... + 3292241.

It is an arithmetic number, because the mean of its divisors is an integer number (995594682411).

Almost surely, 2^{3982372943621} is an apocalyptic number.

It is an amenable number.

3982372943621 is a deficient number, since it is larger than the sum of its proper divisors (5786023).

3982372943621 is an equidigital number, since it uses as much as digits as its factorization.

3982372943621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5786022.

The product of its digits is 23514624, while the sum is 59.

The spelling of 3982372943621 in words is "three trillion, nine hundred eighty-two billion, three hundred seventy-two million, nine hundred forty-three thousand, six hundred twenty-one".