3993191 has 4 divisors (see below), whose sum is σ = 4166832. Its totient is φ = 3819552.

The previous prime is 3993161. The next prime is 3993193. The reversal of 3993191 is 1913993.

It is a happy number.

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 3993191 - 2⁶ = 3993127 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 (3993193) 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, 86786 + ... + 86831.

It is an arithmetic number, because the mean of its divisors is an integer number (1041708).

Almost surely, 2^3993191 is an apocalyptic number.

3993191 is a deficient number, since it is larger than the sum of its proper divisors (173641).

3993191 is a wasteful number, since it uses less digits than its factorization.

3993191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173640.

The product of its digits is 6561, while the sum is 35.

The square root of 3993191 is about 1998.2970249690. The cubic root of 3993191 is about 158.6499822588.

The spelling of 3993191 in words is "three million, nine hundred ninety-three thousand, one hundred ninety-one".