3847391 has 4 divisors (see below), whose sum is σ = 3853752. Its totient is φ = 3841032.

The previous prime is 3847357. The next prime is 3847397. The reversal of 3847391 is 1937483.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1937483 = 101 ⋅19183.

It is a cyclic number.

It is not a de Polignac number, because 3847391 - 2¹⁴ = 3831007 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 (3847397) 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, 2165 + ... + 3518.

It is an arithmetic number, because the mean of its divisors is an integer number (963438).

Almost surely, 2^3847391 is an apocalyptic number.

3847391 is a deficient number, since it is larger than the sum of its proper divisors (6361).

3847391 is an equidigital number, since it uses as much as digits as its factorization.

3847391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6360.

The product of its digits is 18144, while the sum is 35.

The square root of 3847391 is about 1961.4767396021. The cubic root of 3847391 is about 156.6951092668.

The spelling of 3847391 in words is "three million, eight hundred forty-seven thousand, three hundred ninety-one".