3879858921 has 4 divisors (see below), whose sum is σ = 5173145232. Its totient is φ = 2586572612.

The previous prime is 3879858901. The next prime is 3879858953. The reversal of 3879858921 is 1298589783.

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.

It is a cyclic number.

It is not a de Polignac number, because 3879858921 - 2¹⁰ = 3879857897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3879858901) 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, 646643151 + ... + 646643156.

It is an arithmetic number, because the mean of its divisors is an integer number (1293286308).

Almost surely, 2^3879858921 is an apocalyptic number.

It is an amenable number.

3879858921 is a deficient number, since it is larger than the sum of its proper divisors (1293286311).

3879858921 is a wasteful number, since it uses less digits than its factorization.

3879858921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1293286310.

The product of its digits is 8709120, while the sum is 60.

The square root of 3879858921 is about 62288.5135558716. The cubic root of 3879858921 is about 1571.3465560907.

The spelling of 3879858921 in words is "three billion, eight hundred seventy-nine million, eight hundred fifty-eight thousand, nine hundred twenty-one".