261724 has 12 divisors (see below), whose sum is σ = 466200. Its totient is φ = 128528.

The previous prime is 261721. The next prime is 261739. The reversal of 261724 is 427162.

It is a junction number, because it is equal to n+sod(n) for n = 261695 and 261704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261721) 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 3 ways as a sum of consecutive naturals, for example, 319 + ... + 790.

It is an arithmetic number, because the mean of its divisors is an integer number (38850).

2²⁶¹⁷²⁴ is an apocalyptic number.

It is an amenable number.

261724 is a deficient number, since it is larger than the sum of its proper divisors (204476).

261724 is a wasteful number, since it uses less digits than its factorization.

261724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1172 (or 1170 counting only the distinct ones).

The product of its digits is 672, while the sum is 22.

The square root of 261724 is about 511.5896793330. The cubic root of 261724 is about 63.9658020423.

Adding to 261724 its reverse (427162), we get a palindrome (688886).

The spelling of 261724 in words is "two hundred sixty-one thousand, seven hundred twenty-four".