655889 has 6 divisors (see below), whose sum is σ = 710406. Its totient is φ = 605280.

The previous prime is 655883. The next prime is 655901. The reversal of 655889 is 988556.

It can be written as a sum of positive squares in 3 ways, for example, as 3025 + 652864 = 55^2 + 808^2 .

It is not a de Polignac number, because 655889 - 2¹² = 651793 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 (655883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1772 + ... + 2109.

It is an arithmetic number, because the mean of its divisors is an integer number (118401).

2⁶⁵⁵⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

655889 is a deficient number, since it is larger than the sum of its proper divisors (54517).

655889 is a wasteful number, since it uses less digits than its factorization.

655889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3907 (or 3894 counting only the distinct ones).

The product of its digits is 86400, while the sum is 41.

The square root of 655889 is about 809.8697426130. The cubic root of 655889 is about 86.8847286519.

The spelling of 655889 in words is "six hundred fifty-five thousand, eight hundred eighty-nine".