253366218 has 80 divisors (see below), whose sum is σ = 651657600. Its totient is φ = 72075744.

The previous prime is 253366213. The next prime is 253366219. The reversal of 253366218 is 812663352.

It is a happy number.

253366218 is a `hidden beast` number, since 25 + 3 + 3 + 6 + 621 + 8 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (253366213) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 422683 + ... + 423281.

It is an arithmetic number, because the mean of its divisors is an integer number (8145720).

Almost surely, 2^253366218 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 253366218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (325828800).

253366218 is an abundant number, since it is smaller than the sum of its proper divisors (398291382).

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

253366218 is a wasteful number, since it uses less digits than its factorization.

253366218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993 (or 984 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 253366218 is about 15917.4815218991. The cubic root of 253366218 is about 632.7753745792.

The spelling of 253366218 in words is "two hundred fifty-three million, three hundred sixty-six thousand, two hundred eighteen".