4018891 has 4 divisors (see below), whose sum is σ = 4058784. Its totient is φ = 3979000.

The previous prime is 4018879. The next prime is 4018897. The reversal of 4018891 is 1988104.

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 4018891 - 2⁹ = 4018379 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4018897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19795 + ... + 19996.

It is an arithmetic number, because the mean of its divisors is an integer number (1014696).

Almost surely, 2^4018891 is an apocalyptic number.

4018891 is a deficient number, since it is larger than the sum of its proper divisors (39893).

4018891 is a wasteful number, since it uses less digits than its factorization.

4018891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39892.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 4018891 is about 2004.7171870366. The cubic root of 4018891 is about 158.9896094366.

The spelling of 4018891 in words is "four million, eighteen thousand, eight hundred ninety-one".