659844 has 18 divisors (see below), whose sum is σ = 1668030. Its totient is φ = 219936.

The previous prime is 659843. The next prime is 659849. The reversal of 659844 is 448956.

It can be written as a sum of positive squares in only one way, i.e., 562500 + 97344 = 750^2 + 312^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 18329 = 659844 / (6 + 5 + 9 + 8 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 659799 and 659808.

It is not an unprimeable number, because it can be changed into a prime (659843) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9129 + ... + 9200.

659844 is a Friedman number, since it can be written as 9*(6^5+4+4^8), using all its digits and the basic arithmetic operations.

2⁶⁵⁹⁸⁴⁴ is an apocalyptic number.

It is an amenable number.

659844 is an abundant number, since it is smaller than the sum of its proper divisors (1008186).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

659844 is a wasteful number, since it uses less digits than its factorization.

659844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18339 (or 18334 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 659844 is about 812.3078234266. The cubic root of 659844 is about 87.0590166354.

The spelling of 659844 in words is "six hundred fifty-nine thousand, eight hundred forty-four".