253240345 has 16 divisors (see below), whose sum is σ = 307622160. Its totient is φ = 200116224.

The previous prime is 253240343. The next prime is 253240349. The reversal of 253240345 is 543042352.

It can be written as a sum of positive squares in 8 ways, for example, as 70341769 + 182898576 = 8387^2 + 13524^2 .

It is a cyclic number.

It is not a de Polignac number, because 253240345 - 2¹ = 253240343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (253240343) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 223741 + ... + 224869.

It is an arithmetic number, because the mean of its divisors is an integer number (19226385).

Almost surely, 2^253240345 is an apocalyptic number.

It is an amenable number.

253240345 is a deficient number, since it is larger than the sum of its proper divisors (54381815).

253240345 is a wasteful number, since it uses less digits than its factorization.

253240345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644.

The product of its (nonzero) digits is 14400, while the sum is 28.

The square root of 253240345 is about 15913.5271074643. The cubic root of 253240345 is about 632.6705690675.

Adding to 253240345 its reverse (543042352), we get a palindrome (796282697).

The spelling of 253240345 in words is "two hundred fifty-three million, two hundred forty thousand, three hundred forty-five".