3975071821 has 8 divisors (see below), whose sum is σ = 4575623360. Its totient is φ = 3382691328.

The previous prime is 3975071819. The next prime is 3975071827. The reversal of 3975071821 is 1281705793.

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 3975071821 - 2¹ = 3975071819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3975071827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2041716 + ... + 2043661.

It is an arithmetic number, because the mean of its divisors is an integer number (571952920).

Almost surely, 2^3975071821 is an apocalyptic number.

It is an amenable number.

3975071821 is a deficient number, since it is larger than the sum of its proper divisors (600551539).

3975071821 is a wasteful number, since it uses less digits than its factorization.

3975071821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4085523.

The product of its (nonzero) digits is 105840, while the sum is 43.

The square root of 3975071821 is about 63048.1706395991. The cubic root of 3975071821 is about 1584.0965931227.

The spelling of 3975071821 in words is "three billion, nine hundred seventy-five million, seventy-one thousand, eight hundred twenty-one".