249605 has 4 divisors (see below), whose sum is σ = 299532. Its totient is φ = 199680.

The previous prime is 249593. The next prime is 249607. The reversal of 249605 is 506942.

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 160801 + 88804 = 401^2 + 298^2 .

It is not a de Polignac number, because 249605 - 2⁴ = 249589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 249605.

It is not an unprimeable number, because it can be changed into a prime (249607) 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, 24956 + ... + 24965.

It is an arithmetic number, because the mean of its divisors is an integer number (74883).

2²⁴⁹⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

249605 is a deficient number, since it is larger than the sum of its proper divisors (49927).

249605 is an equidigital number, since it uses as much as digits as its factorization.

249605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49926.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 249605 is about 499.6048438516. The cubic root of 249605 is about 62.9628570847.

The spelling of 249605 in words is "two hundred forty-nine thousand, six hundred five".