3897821071 has 4 divisors (see below), whose sum is σ = 3898974600. Its totient is φ = 3896667544.

The previous prime is 3897821051. The next prime is 3897821089. The reversal of 3897821071 is 1701287983.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3897821071 - 2⁹ = 3897820559 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 (3897821021) 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, 571681 + ... + 578458.

It is an arithmetic number, because the mean of its divisors is an integer number (974743650).

Almost surely, 2^3897821071 is an apocalyptic number.

3897821071 is a deficient number, since it is larger than the sum of its proper divisors (1153529).

3897821071 is a wasteful number, since it uses less digits than its factorization.

3897821071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1153528.

The product of its (nonzero) digits is 169344, while the sum is 46.

The square root of 3897821071 is about 62432.5321527167. The cubic root of 3897821071 is about 1573.7677195448.

The spelling of 3897821071 in words is "three billion, eight hundred ninety-seven million, eight hundred twenty-one thousand, seventy-one".