655789 has 4 divisors (see below), whose sum is σ = 660124. Its totient is φ = 651456.

The previous prime is 655757. The next prime is 655807. The reversal of 655789 is 987556.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 422500 + 233289 = 650^2 + 483^2 .

It is a cyclic number.

It is not a de Polignac number, because 655789 - 2⁵ = 655757 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 (655289) 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, 1932 + ... + 2245.

It is an arithmetic number, because the mean of its divisors is an integer number (165031).

2⁶⁵⁵⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

655789 is a deficient number, since it is larger than the sum of its proper divisors (4335).

655789 is a wasteful number, since it uses less digits than its factorization.

655789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4334.

The product of its digits is 75600, while the sum is 40.

The square root of 655789 is about 809.8080019363. The cubic root of 655789 is about 86.8803128059.

It can be divided in two parts, 655 and 789, that added together give a square (1444 = 38²).

The spelling of 655789 in words is "six hundred fifty-five thousand, seven hundred eighty-nine".