253689 has 8 divisors (see below), whose sum is σ = 341952. Its totient is φ = 167280.

The previous prime is 253681. The next prime is 253703. The reversal of 253689 is 986352.

It is a happy number.

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

It is not a de Polignac number, because 253689 - 2³ = 253681 is a prime.

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 253689.

It is not an unprimeable number, because it can be changed into a prime (253681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102 + ... + 719.

It is an arithmetic number, because the mean of its divisors is an integer number (42744).

2²⁵³⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

253689 is a deficient number, since it is larger than the sum of its proper divisors (88263).

253689 is a wasteful number, since it uses less digits than its factorization.

253689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927.

The product of its digits is 12960, while the sum is 33.

The square root of 253689 is about 503.6754907676. The cubic root of 253689 is about 63.3043973695.

The spelling of 253689 in words is "two hundred fifty-three thousand, six hundred eighty-nine".