261382 has 12 divisors (see below), whose sum is σ = 431676. Its totient is φ = 117720.

The previous prime is 261379. The next prime is 261389. The reversal of 261382 is 283162.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261389) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 2344 + ... + 2452.

It is an arithmetic number, because the mean of its divisors is an integer number (35973).

2²⁶¹³⁸² is an apocalyptic number.

261382 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

261382 is a deficient number, since it is larger than the sum of its proper divisors (170294).

261382 is a wasteful number, since it uses less digits than its factorization.

261382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231 (or 122 counting only the distinct ones).

The product of its digits is 576, while the sum is 22.

The square root of 261382 is about 511.2553178208. The cubic root of 261382 is about 63.9379280988.

Multiplying 261382 by its sum of digits (22), we get a square (5750404 = 2398²).

261382 divided by its sum of digits (22) gives a square (11881 = 109²).

The spelling of 261382 in words is "two hundred sixty-one thousand, three hundred eighty-two".