253818 has 24 divisors (see below), whose sum is σ = 561600. Its totient is φ = 82824.

The previous prime is 253811. The next prime is 253819. The reversal of 253818 is 818352.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 253791 and 253800.

It is not an unprimeable number, because it can be changed into a prime (253811) by changing a digit.

253818 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 in 11 ways as a sum of consecutive naturals, for example, 943 + ... + 1181.

It is an arithmetic number, because the mean of its divisors is an integer number (23400).

2²⁵³⁸¹⁸ is an apocalyptic number.

253818 is an abundant number, since it is smaller than the sum of its proper divisors (307782).

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

253818 is a wasteful number, since it uses less digits than its factorization.

253818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306 (or 303 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 253818 is about 503.8035331357. The cubic root of 253818 is about 63.3151255754.

It can be divided in two parts, 2538 and 18, that added together give a triangular number (2556 = T₇₁).

The spelling of 253818 in words is "two hundred fifty-three thousand, eight hundred eighteen".