4006559 has 4 divisors (see below), whose sum is σ = 4012920. Its totient is φ = 4000200.

The previous prime is 4006547. The next prime is 4006567. The reversal of 4006559 is 9556004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4006559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4006529) 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 in 3 ways as a sum of consecutive naturals, for example, 2117 + ... + 3534.

It is an arithmetic number, because the mean of its divisors is an integer number (1003230).

Almost surely, 2^4006559 is an apocalyptic number.

4006559 is a deficient number, since it is larger than the sum of its proper divisors (6361).

4006559 is an equidigital number, since it uses as much as digits as its factorization.

4006559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6360.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 4006559 is about 2001.6390783555. The cubic root of 4006559 is about 158.8268225117.

The spelling of 4006559 in words is "four million, six thousand, five hundred fifty-nine".