4043891 has 2 divisors, whose sum is σ = 4043892. Its totient is φ = 4043890.

The previous prime is 4043887. The next prime is 4043899. The reversal of 4043891 is 1983404.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4043891 - 2² = 4043887 is a prime.

It is not a weakly prime, because it can be changed into another prime (4043899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2021945 + 2021946.

It is an arithmetic number, because the mean of its divisors is an integer number (2021946).

Almost surely, 2^4043891 is an apocalyptic number.

4043891 is a deficient number, since it is larger than the sum of its proper divisors (1).

4043891 is an equidigital number, since it uses as much as digits as its factorization.

4043891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 4043891 is about 2010.9428137070. The cubic root of 4043891 is about 159.3185995997.

The spelling of 4043891 in words is "four million, forty-three thousand, eight hundred ninety-one".