4081999 has 2 divisors, whose sum is σ = 4082000. Its totient is φ = 4081998.

The previous prime is 4081991. The next prime is 4082021. The reversal of 4081999 is 9991804.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4081999 - 2³ = 4081991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4081991) 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, 2040999 + 2041000.

It is an arithmetic number, because the mean of its divisors is an integer number (2041000).

Almost surely, 2^4081999 is an apocalyptic number.

4081999 is a deficient number, since it is larger than the sum of its proper divisors (1).

4081999 is an equidigital number, since it uses as much as digits as its factorization.

4081999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 4081999 is about 2020.3957533117. The cubic root of 4081999 is about 159.8174871984.

The spelling of 4081999 in words is "four million, eighty-one thousand, nine hundred ninety-nine".