261238 has 4 divisors (see below), whose sum is σ = 391860. Its totient is φ = 130618.

The previous prime is 261229. The next prime is 261241. The reversal of 261238 is 832162.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

261238 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 as a sum of consecutive naturals, namely, 65308 + ... + 65311.

It is an arithmetic number, because the mean of its divisors is an integer number (97965).

2²⁶¹²³⁸ is an apocalyptic number.

261238 is a deficient number, since it is larger than the sum of its proper divisors (130622).

261238 is a wasteful number, since it uses less digits than its factorization.

261238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130621.

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

The square root of 261238 is about 511.1144685880. The cubic root of 261238 is about 63.9261844274.

The spelling of 261238 in words is "two hundred sixty-one thousand, two hundred thirty-eight".