245645 has 8 divisors (see below), whose sum is σ = 299256. Its totient is φ = 193536.

The previous prime is 245639. The next prime is 245653. The reversal of 245645 is 546542.

It can be written as a sum of positive squares in 4 ways, for example, as 17161 + 228484 = 131^2 + 478^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 245645 - 2⁴ = 245629 is a prime.

It is a super-3 number, since 3×245645³ = 44467738265133375, which contains 333 as substring.

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 7 ways as a sum of consecutive naturals, for example, 29 + ... + 701.

It is an arithmetic number, because the mean of its divisors is an integer number (37407).

2²⁴⁵⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

245645 is a deficient number, since it is larger than the sum of its proper divisors (53611).

245645 is an equidigital number, since it uses as much as digits as its factorization.

245645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751.

The product of its digits is 4800, while the sum is 26.

The square root of 245645 is about 495.6258669601. The cubic root of 245645 is about 62.6281105569.

The spelling of 245645 in words is "two hundred forty-five thousand, six hundred forty-five".