4028491 has 2 divisors, whose sum is σ = 4028492. Its totient is φ = 4028490.

The previous prime is 4028471. The next prime is 4028533. The reversal of 4028491 is 1948204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4028491 - 2⁷ = 4028363 is a prime.

It is not a weakly prime, because it can be changed into another prime (4028441) 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 as a sum of consecutive naturals, namely, 2014245 + 2014246.

It is an arithmetic number, because the mean of its divisors is an integer number (2014246).

Almost surely, 2^4028491 is an apocalyptic number.

4028491 is a deficient number, since it is larger than the sum of its proper divisors (1).

4028491 is an equidigital number, since it uses as much as digits as its factorization.

4028491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 4028491 is about 2007.1101115783. The cubic root of 4028491 is about 159.1161025878.

The spelling of 4028491 in words is "four million, twenty-eight thousand, four hundred ninety-one".