3879821 has 4 divisors (see below), whose sum is σ = 4232544. Its totient is φ = 3527100.

The previous prime is 3879817. The next prime is 3879829. The reversal of 3879821 is 1289783.

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 3879821 - 2² = 3879817 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 (3879829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176345 + ... + 176366.

It is an arithmetic number, because the mean of its divisors is an integer number (1058136).

Almost surely, 2^3879821 is an apocalyptic number.

It is an amenable number.

3879821 is a deficient number, since it is larger than the sum of its proper divisors (352723).

3879821 is a wasteful number, since it uses less digits than its factorization.

3879821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352722.

The product of its digits is 24192, while the sum is 38.

The square root of 3879821 is about 1969.7261230943. The cubic root of 3879821 is about 157.1341436727.

Subtracting from 3879821 its sum of digits (38), we obtain a palindrome (3879783).

The spelling of 3879821 in words is "three million, eight hundred seventy-nine thousand, eight hundred twenty-one".