659440 has 20 divisors (see below), whose sum is σ = 1533384. Its totient is φ = 263744.

The previous prime is 659437. The next prime is 659453. The reversal of 659440 is 44956.

659440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×659440² = 869722227200, which contains 22 as substring.

It is a zygodrome in base 4.

It is a junction number, because it is equal to n+sod(n) for n = 659399 and 659408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4042 + ... + 4201.

2⁶⁵⁹⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

659440 is an abundant number, since it is smaller than the sum of its proper divisors (873944).

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

659440 is a wasteful number, since it uses less digits than its factorization.

659440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8256 (or 8250 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 659440 is about 812.0591111489. The cubic root of 659440 is about 87.0412452514.

The spelling of 659440 in words is "six hundred fifty-nine thousand, four hundred forty".