3928191 has 4 divisors (see below), whose sum is σ = 5237592. Its totient is φ = 2618792.

The previous prime is 3928189. The next prime is 3928229. The reversal of 3928191 is 1918293.

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 3928191 - 2¹ = 3928189 is a prime.

It is a D-number.

3928191 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3928151) 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, 654696 + ... + 654701.

It is an arithmetic number, because the mean of its divisors is an integer number (1309398).

Almost surely, 2^3928191 is an apocalyptic number.

3928191 is a deficient number, since it is larger than the sum of its proper divisors (1309401).

3928191 is a wasteful number, since it uses less digits than its factorization.

3928191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1309400.

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

The square root of 3928191 is about 1981.9664477483. The cubic root of 3928191 is about 157.7844494339.

The spelling of 3928191 in words is "three million, nine hundred twenty-eight thousand, one hundred ninety-one".