261944 has 16 divisors (see below), whose sum is σ = 496800. Its totient is φ = 129472.

The previous prime is 261917. The next prime is 261959. The reversal of 261944 is 449162.

It is a super-2 number, since 2×261944² = 137229318272, which contains 22 as substring.

It is a zygodrome in base 2.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 261944.

It is an unprimeable number.

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, 977 + ... + 1215.

It is an arithmetic number, because the mean of its divisors is an integer number (31050).

2²⁶¹⁹⁴⁴ is an apocalyptic number.

It is an amenable number.

261944 is a deficient number, since it is larger than the sum of its proper divisors (234856).

261944 is a wasteful number, since it uses less digits than its factorization.

261944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382 (or 378 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 261944 is about 511.8046502329. The cubic root of 261944 is about 63.9837198174.

The spelling of 261944 in words is "two hundred sixty-one thousand, nine hundred forty-four".