261588 has 12 divisors (see below), whose sum is σ = 610400.
Its totient is φ = 87192.
The previous prime is 261587. The next prime is 261593. The reversal of 261588 is 885162.
It is a tau number, because it is divible by the number of its divisors (12).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (261581) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10888 + ... + 10911.
2261588 is an apocalyptic number.
It is an amenable number.
261588 is an abundant number, since it is smaller than the sum of its proper divisors (348812).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
261588 is a wasteful number, since it uses less digits than its factorization.
261588 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 21806 (or 21804 counting only the distinct ones).
The product of its digits is 3840, while the sum is 30.
The square root of 261588 is about 511.4567430389.
The cubic root of 261588 is about 63.9547205769.
The spelling of 261588 in words is "two hundred sixty-one thousand, five hundred eighty-eight".