253018 has 8 divisors (see below), whose sum is σ = 384948. Its totient is φ = 124704.

The previous prime is 253013. The next prime is 253049. The reversal of 253018 is 810352.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 253009 + 9 = 503^2 + 3^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 252986 and 253004.

It is not an unprimeable number, because it can be changed into a prime (253013) by changing a digit.

253018 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 721 + ... + 1012.

253018 is a Friedman number, since it can be written as 503^2+8+1, using all its digits and the basic arithmetic operations.

2²⁵³⁰¹⁸ is an apocalyptic number.

253018 is a deficient number, since it is larger than the sum of its proper divisors (131930).

253018 is a wasteful number, since it uses less digits than its factorization.

253018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1808.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 253018 is about 503.0089462425. The cubic root of 253018 is about 63.2485353283.

The spelling of 253018 in words is "two hundred fifty-three thousand, eighteen".