261896 has 16 divisors (see below), whose sum is σ = 517200. Its totient is φ = 123984.

The previous prime is 261887. The next prime is 261917. The reversal of 261896 is 698162.

It is a nialpdrome in base 8.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 710 + ... + 1013.

It is an arithmetic number, because the mean of its divisors is an integer number (32325).

2²⁶¹⁸⁹⁶ is an apocalyptic number.

It is an amenable number.

261896 is a deficient number, since it is larger than the sum of its proper divisors (255304).

261896 is a wasteful number, since it uses less digits than its factorization.

261896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1748 (or 1744 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

The square root of 261896 is about 511.7577551928. The cubic root of 261896 is about 63.9798113405.

The spelling of 261896 in words is "two hundred sixty-one thousand, eight hundred ninety-six".