261904 has 10 divisors (see below), whose sum is σ = 507470. Its totient is φ = 130944.
The previous prime is 261887. The next prime is 261917. The reversal of 261904 is 409162.
It can be written as a sum of positive squares in only one way, i.e., 204304 + 57600 = 452^2 + 240^2 .
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 as a sum of consecutive naturals, namely, 8169 + ... + 8200.
It is an arithmetic number, because the mean of its divisors is an integer number (50747).
261904 is a Friedman number, since it can be written as (9-1)^6-240, using all its digits and the basic arithmetic operations.
2261904 is an apocalyptic number.
It is an amenable number.
261904 is a deficient number, since it is larger than the sum of its proper divisors (245566).
261904 is a wasteful number, since it uses less digits than its factorization.
261904 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 16377 (or 16371 counting only the distinct ones).
The product of its (nonzero) digits is 432, while the sum is 22.
The square root of 261904 is about 511.7655713312. The cubic root of 261904 is about 63.9804627865.
The spelling of 261904 in words is "two hundred sixty-one thousand, nine hundred four".
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