253645 has 8 divisors (see below), whose sum is σ = 347904. Its totient is φ = 173904.

The previous prime is 253639. The next prime is 253651. The reversal of 253645 is 546352.

It is an interprime number because it is at equal distance from previous prime (253639) and next prime (253651).

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 253645 - 2³ = 253637 is a prime.

It is a super-3 number, since 3×253645³ = 48955351338933375, 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, 3589 + ... + 3658.

It is an arithmetic number, because the mean of its divisors is an integer number (43488).

2²⁵³⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

253645 is a deficient number, since it is larger than the sum of its proper divisors (94259).

253645 is an equidigital number, since it uses as much as digits as its factorization.

253645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7259.

The product of its digits is 3600, while the sum is 25.

The square root of 253645 is about 503.6318099564. The cubic root of 253645 is about 63.3007373047.

Adding to 253645 its reverse (546352), we get a palindrome (799997).

It can be divided in two parts, 253 and 645, that added together give a palindrome (898).

The spelling of 253645 in words is "two hundred fifty-three thousand, six hundred forty-five".