253218 has 16 divisors (see below), whose sum is σ = 578880. Its totient is φ = 72336.

The previous prime is 253159. The next prime is 253229. The reversal of 253218 is 812352.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 253194 and 253203.

It is an unprimeable number.

253218 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 7 ways as a sum of consecutive naturals, for example, 2973 + ... + 3056.

It is an arithmetic number, because the mean of its divisors is an integer number (36180).

2²⁵³²¹⁸ is an apocalyptic number.

253218 is an abundant number, since it is smaller than the sum of its proper divisors (325662).

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

253218 is a wasteful number, since it uses less digits than its factorization.

253218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6041.

The product of its digits is 480, while the sum is 21.

The square root of 253218 is about 503.2077105928. The cubic root of 253218 is about 63.2651960343.

The spelling of 253218 in words is "two hundred fifty-three thousand, two hundred eighteen".