4008391 has 2 divisors, whose sum is σ = 4008392. Its totient is φ = 4008390.

The previous prime is 4008377. The next prime is 4008397. The reversal of 4008391 is 1938004.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4008391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4008397) 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, 2004195 + 2004196.

It is an arithmetic number, because the mean of its divisors is an integer number (2004196).

Almost surely, 2^4008391 is an apocalyptic number.

4008391 is a deficient number, since it is larger than the sum of its proper divisors (1).

4008391 is an equidigital number, since it uses as much as digits as its factorization.

4008391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 4008391 is about 2002.0966510136. The cubic root of 4008391 is about 158.8510266896.

The spelling of 4008391 in words is "four million, eight thousand, three hundred ninety-one".