3921189 has 4 divisors (see below), whose sum is σ = 5228256. Its totient is φ = 2614124.

The previous prime is 3921179. The next prime is 3921191. The reversal of 3921189 is 9811293.

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: 9811293 = 3 ⋅3270431.

It is a cyclic number.

It is not a de Polignac number, because 3921189 - 2⁴ = 3921173 is a prime.

It is a D-number.

3921189 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3921139) 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, 653529 + ... + 653534.

It is an arithmetic number, because the mean of its divisors is an integer number (1307064).

Almost surely, 2^3921189 is an apocalyptic number.

It is an amenable number.

3921189 is a deficient number, since it is larger than the sum of its proper divisors (1307067).

3921189 is a wasteful number, since it uses less digits than its factorization.

3921189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1307066.

The product of its digits is 3888, while the sum is 33.

The square root of 3921189 is about 1980.1992324006. The cubic root of 3921189 is about 157.6906434212.

The spelling of 3921189 in words is "three million, nine hundred twenty-one thousand, one hundred eighty-nine".