4081391 has 4 divisors (see below), whose sum is σ = 4088784. Its totient is φ = 4074000.

The previous prime is 4081387. The next prime is 4081393. The reversal of 4081391 is 1931804.

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 4081391 - 2² = 4081387 is a prime.

It is a super-3 number, since 3×4081391³ (a number of 21 digits) contains 333 as substring.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 4081391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4081393) 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, 2795 + ... + 3996.

It is an arithmetic number, because the mean of its divisors is an integer number (1022196).

Almost surely, 2^4081391 is an apocalyptic number.

4081391 is a deficient number, since it is larger than the sum of its proper divisors (7393).

4081391 is an equidigital number, since it uses as much as digits as its factorization.

4081391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7392.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 4081391 is about 2020.2452821378. The cubic root of 4081391 is about 159.8095520456.

It can be divided in two parts, 40813 and 91, that added together give a palindrome (40904).

The spelling of 4081391 in words is "four million, eighty-one thousand, three hundred ninety-one".