3982728521 has 4 divisors (see below), whose sum is σ = 3983209344. Its totient is φ = 3982247700.

The previous prime is 3982728517. The next prime is 3982728539. The reversal of 3982728521 is 1258272893.

3982728521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1258272893 = 1697 ⋅741469.

It is a cyclic number.

It is not a de Polignac number, because 3982728521 - 2² = 3982728517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3982728571) 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, 227765 + ... + 244626.

It is an arithmetic number, because the mean of its divisors is an integer number (995802336).

Almost surely, 2^3982728521 is an apocalyptic number.

It is an amenable number.

3982728521 is a deficient number, since it is larger than the sum of its proper divisors (480823).

3982728521 is an equidigital number, since it uses as much as digits as its factorization.

3982728521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480822.

The product of its digits is 483840, while the sum is 47.

The square root of 3982728521 is about 63108.8624600381. The cubic root of 3982728521 is about 1585.1130253401.

The spelling of 3982728521 in words is "three billion, nine hundred eighty-two million, seven hundred twenty-eight thousand, five hundred twenty-one".