261338 has 16 divisors (see below), whose sum is σ = 489024. Its totient is φ = 101760.

The previous prime is 261337. The next prime is 261347. The reversal of 261338 is 833162.

It is a Curzon number.

It is a nialpdrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261337) 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, 695 + ... + 1002.

It is an arithmetic number, because the mean of its divisors is an integer number (30564).

2²⁶¹³³⁸ is an apocalyptic number.

261338 is a deficient number, since it is larger than the sum of its proper divisors (227686).

261338 is a wasteful number, since it uses less digits than its factorization.

261338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1717.

The product of its digits is 864, while the sum is 23.

The square root of 261338 is about 511.2122846724. The cubic root of 261338 is about 63.9343402125.

The spelling of 261338 in words is "two hundred sixty-one thousand, three hundred thirty-eight".