253678 has 4 divisors (see below), whose sum is σ = 380520. Its totient is φ = 126838.

The previous prime is 253661. The next prime is 253679. The reversal of 253678 is 876352.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253679) by changing a digit.

253678 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63418 + ... + 63421.

It is an arithmetic number, because the mean of its divisors is an integer number (95130).

2²⁵³⁶⁷⁸ is an apocalyptic number.

253678 is a deficient number, since it is larger than the sum of its proper divisors (126842).

253678 is a wasteful number, since it uses less digits than its factorization.

253678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126841.

The product of its digits is 10080, while the sum is 31.

The square root of 253678 is about 503.6645709200. The cubic root of 253678 is about 63.3034823930.

The spelling of 253678 in words is "two hundred fifty-three thousand, six hundred seventy-eight".