253649 has 4 divisors (see below), whose sum is σ = 276720. Its totient is φ = 230580.

The previous prime is 253639. The next prime is 253651. The reversal of 253649 is 946352.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 253649 - 2⁴ = 253633 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 253649.

It is not an unprimeable number, because it can be changed into a prime (253609) 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, 11519 + ... + 11540.

It is an arithmetic number, because the mean of its divisors is an integer number (69180).

2²⁵³⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

253649 is a deficient number, since it is larger than the sum of its proper divisors (23071).

253649 is a wasteful number, since it uses less digits than its factorization.

253649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23070.

The product of its digits is 6480, while the sum is 29.

The square root of 253649 is about 503.6357810958. The cubic root of 253649 is about 63.3010700554.

The spelling of 253649 in words is "two hundred fifty-three thousand, six hundred forty-nine".