261842 has 16 divisors (see below), whose sum is σ = 457920. Its totient is φ = 109968.

The previous prime is 261823. The next prime is 261847. The reversal of 261842 is 248162.

It is a super-2 number, since 2×261842² = 137122465928, which contains 22 as substring.

It is a nialpdrome in base 8.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 261842.

It is not an unprimeable number, because it can be changed into a prime (261847) 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 7 ways as a sum of consecutive naturals, for example, 668 + ... + 984.

It is an arithmetic number, because the mean of its divisors is an integer number (28620).

2²⁶¹⁸⁴² is an apocalyptic number.

261842 is a deficient number, since it is larger than the sum of its proper divisors (196078).

261842 is a wasteful number, since it uses less digits than its factorization.

261842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385.

The product of its digits is 768, while the sum is 23.

The square root of 261842 is about 511.7049931357. The cubic root of 261842 is about 63.9754137332.

The spelling of 261842 in words is "two hundred sixty-one thousand, eight hundred forty-two".