260657 has 4 divisors (see below), whose sum is σ = 261876. Its totient is φ = 259440.

The previous prime is 260651. The next prime is 260671. The reversal of 260657 is 756062.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 99856 + 160801 = 316^2 + 401^2 .

It is a cyclic number.

It is not a de Polignac number, because 260657 - 2¹² = 256561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (260651) by changing a digit.

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, 194 + ... + 747.

It is an arithmetic number, because the mean of its divisors is an integer number (65469).

2²⁶⁰⁶⁵⁷ is an apocalyptic number.

It is an amenable number.

260657 is a deficient number, since it is larger than the sum of its proper divisors (1219).

260657 is an equidigital number, since it uses as much as digits as its factorization.

260657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1218.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 260657 is about 510.5457863894. The cubic root of 260657 is about 63.8787580940.

It can be divided in two parts, 260 and 657, that multiplied together give a triangular number (170820 = T₅₈₄).

The spelling of 260657 in words is "two hundred sixty thousand, six hundred fifty-seven".