261444 has 12 divisors (see below), whose sum is σ = 610064. Its totient is φ = 87144.

The previous prime is 261439. The next prime is 261451. The reversal of 261444 is 444162.

It is a tau number, because it is divible by the number of its divisors (12).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 261444.

It is an unprimeable number.

261444 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10882 + ... + 10905.

2²⁶¹⁴⁴⁴ is an apocalyptic number.

It is an amenable number.

261444 is an abundant number, since it is smaller than the sum of its proper divisors (348620).

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

261444 is a wasteful number, since it uses less digits than its factorization.

261444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21794 (or 21792 counting only the distinct ones).

The product of its digits is 768, while the sum is 21.

The square root of 261444 is about 511.3159492916. The cubic root of 261444 is about 63.9429830735.

The spelling of 261444 in words is "two hundred sixty-one thousand, four hundred forty-four".