555989 has 4 divisors (see below), whose sum is σ = 635424. Its totient is φ = 476556.

The previous prime is 555967. The next prime is 556007. The reversal of 555989 is 989555.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 555989 - 2¹⁶ = 490453 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 (555589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39707 + ... + 39720.

It is an arithmetic number, because the mean of its divisors is an integer number (158856).

2⁵⁵⁵⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

555989 is a deficient number, since it is larger than the sum of its proper divisors (79435).

555989 is an equidigital number, since it uses as much as digits as its factorization.

555989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79434.

The product of its digits is 81000, while the sum is 41.

The square root of 555989 is about 745.6466991813. The cubic root of 555989 is about 82.2284429052.

The spelling of 555989 in words is "five hundred fifty-five thousand, nine hundred eighty-nine".