3998559 has 4 divisors (see below), whose sum is σ = 5331416. Its totient is φ = 2665704.

The previous prime is 3998557. The next prime is 3998567. The reversal of 3998559 is 9558993.

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

It is not a de Polignac number, because 3998559 - 2¹ = 3998557 is a prime.

It is a D-number.

It is a Duffinian number.

3998559 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3998551) 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, 666424 + ... + 666429.

It is an arithmetic number, because the mean of its divisors is an integer number (1332854).

Almost surely, 2^3998559 is an apocalyptic number.

3998559 is a deficient number, since it is larger than the sum of its proper divisors (1332857).

3998559 is a wasteful number, since it uses less digits than its factorization.

3998559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332856.

The product of its digits is 437400, while the sum is 48.

The square root of 3998559 is about 1999.6397175491. The cubic root of 3998559 is about 158.7210408664.

The spelling of 3998559 in words is "three million, nine hundred ninety-eight thousand, five hundred fifty-nine".