253665238 has 16 divisors (see below), whose sum is σ = 401235120. Its totient is φ = 119943936.

The previous prime is 253665187. The next prime is 253665239. The reversal of 253665238 is 832566352.

It is a self number, because there is not a number n which added to its sum of digits gives 253665238.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253665239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16906 + ... + 28162.

It is an arithmetic number, because the mean of its divisors is an integer number (25077195).

Almost surely, 2^253665238 is an apocalyptic number.

253665238 is a deficient number, since it is larger than the sum of its proper divisors (147569882).

253665238 is a wasteful number, since it uses less digits than its factorization.

253665238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11871.

The product of its digits is 259200, while the sum is 40.

The square root of 253665238 is about 15926.8715697716. The cubic root of 253665238 is about 633.0242082073.

The spelling of 253665238 in words is "two hundred fifty-three million, six hundred sixty-five thousand, two hundred thirty-eight".