4047891 has 8 divisors (see below), whose sum is σ = 5522880. Its totient is φ = 2635752.

The previous prime is 4047847. The next prime is 4047929. The reversal of 4047891 is 1987404.

4047891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4047891 - 2¹¹ = 4045843 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (4047811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15561 + ... + 15818.

It is an arithmetic number, because the mean of its divisors is an integer number (690360).

Almost surely, 2^4047891 is an apocalyptic number.

4047891 is a deficient number, since it is larger than the sum of its proper divisors (1474989).

4047891 is a wasteful number, since it uses less digits than its factorization.

4047891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31425.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 4047891 is about 2011.9371262542. The cubic root of 4047891 is about 159.3711120928.

The spelling of 4047891 in words is "four million, forty-seven thousand, eight hundred ninety-one".