261982 has 8 divisors (see below), whose sum is σ = 449136. Its totient is φ = 112272.

The previous prime is 261977. The next prime is 261983. The reversal of 261982 is 289162.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 261982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9343 + ... + 9370.

It is an arithmetic number, because the mean of its divisors is an integer number (56142).

261982 is a Friedman number, since it can be written as 8^6-9^(2*1)*2, using all its digits and the basic arithmetic operations.

2²⁶¹⁹⁸² is an apocalyptic number.

261982 is a deficient number, since it is larger than the sum of its proper divisors (187154).

261982 is a wasteful number, since it uses less digits than its factorization.

261982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18722.

The product of its digits is 1728, while the sum is 28.

The square root of 261982 is about 511.8417724258. The cubic root of 261982 is about 63.9868136896.

It can be divided in two parts, 2619 and 82, that added together give a triangular number (2701 = T₇₃).

The spelling of 261982 in words is "two hundred sixty-one thousand, nine hundred eighty-two".