259649 has 4 divisors (see below), whose sum is σ = 279636. Its totient is φ = 239664.

The previous prime is 259643. The next prime is 259657. The reversal of 259649 is 946952.

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

It can be written as a sum of positive squares in 2 ways, for example, as 66049 + 193600 = 257^2 + 440^2 .

It is a cyclic number.

It is not a de Polignac number, because 259649 - 2¹⁶ = 194113 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (259643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9974 + ... + 9999.

It is an arithmetic number, because the mean of its divisors is an integer number (69909).

2²⁵⁹⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

259649 is a deficient number, since it is larger than the sum of its proper divisors (19987).

259649 is a wasteful number, since it uses less digits than its factorization.

259649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19986.

The product of its digits is 19440, while the sum is 35.

The square root of 259649 is about 509.5576513016. The cubic root of 259649 is about 63.7963087850.

The spelling of 259649 in words is "two hundred fifty-nine thousand, six hundred forty-nine".