245605 has 4 divisors (see below), whose sum is σ = 294732. Its totient is φ = 196480.

The previous prime is 245593. The next prime is 245621. The reversal of 245605 is 506542.

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 45796 + 199809 = 214^2 + 447^2 .

It is not a de Polignac number, because 245605 - 2⁷ = 245477 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24556 + ... + 24565.

It is an arithmetic number, because the mean of its divisors is an integer number (73683).

2²⁴⁵⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

245605 is a deficient number, since it is larger than the sum of its proper divisors (49127).

245605 is an equidigital number, since it uses as much as digits as its factorization.

245605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49126.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 245605 is about 495.5855122983. The cubic root of 245605 is about 62.6247109892.

It can be divided in two parts, 245 and 605, that multiplied together give a square (148225 = 385²).

The spelling of 245605 in words is "two hundred forty-five thousand, six hundred five".