4028891 has 2 divisors, whose sum is σ = 4028892. Its totient is φ = 4028890.

The previous prime is 4028863. The next prime is 4028917. The reversal of 4028891 is 1988204.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4028891 - 2¹⁴ = 4012507 is a prime.

It is not a weakly prime, because it can be changed into another prime (4028851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2014445 + 2014446.

It is an arithmetic number, because the mean of its divisors is an integer number (2014446).

Almost surely, 2^4028891 is an apocalyptic number.

4028891 is a deficient number, since it is larger than the sum of its proper divisors (1).

4028891 is an equidigital number, since it uses as much as digits as its factorization.

4028891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 4028891 is about 2007.2097548587. The cubic root of 4028891 is about 159.1213687726.

The spelling of 4028891 in words is "four million, twenty-eight thousand, eight hundred ninety-one".