4013891 has 16 divisors (see below), whose sum is σ = 4852224. Its totient is φ = 3246144.

The previous prime is 4013881. The next prime is 4013897. The reversal of 4013891 is 1983104.

It is a cyclic number.

It is not a de Polignac number, because 4013891 - 2⁶ = 4013827 is a prime.

It is a super-2 number, since 2×4013891² = 32222641919762, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4013891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4013897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17111 + ... + 17343.

It is an arithmetic number, because the mean of its divisors is an integer number (303264).

Almost surely, 2^4013891 is an apocalyptic number.

4013891 is a deficient number, since it is larger than the sum of its proper divisors (838333).

4013891 is a wasteful number, since it uses less digits than its factorization.

4013891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370.

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

The square root of 4013891 is about 2003.4697402257. The cubic root of 4013891 is about 158.9236477948.

Adding to 4013891 its reverse (1983104), we get a palindrome (5996995).

It can be divided in two parts, 40 and 13891, that added together give a palindrome (13931).

The spelling of 4013891 in words is "four million, thirteen thousand, eight hundred ninety-one".