253644 has 24 divisors (see below), whose sum is σ = 618240. Its totient is φ = 80784.

The previous prime is 253639. The next prime is 253651. The reversal of 253644 is 446352.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 253644.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184 + ... + 735.

It is an arithmetic number, because the mean of its divisors is an integer number (25760).

2²⁵³⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

253644 is an abundant number, since it is smaller than the sum of its proper divisors (364596).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

253644 is a wasteful number, since it uses less digits than its factorization.

253644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949 (or 947 counting only the distinct ones).

The product of its digits is 2880, while the sum is 24.

The square root of 253644 is about 503.6308171667. The cubic root of 253644 is about 63.3006541165.

Adding to 253644 its reverse (446352), we get a palindrome (699996).

The spelling of 253644 in words is "two hundred fifty-three thousand, six hundred forty-four".