253640437 has 2 divisors, whose sum is σ = 253640438. Its totient is φ = 253640436.

The previous prime is 253640417. The next prime is 253640441. The reversal of 253640437 is 734046352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193515921 + 60124516 = 13911^2 + 7754^2 .

It is a cyclic number.

It is not a de Polignac number, because 253640437 - 2¹¹ = 253638389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253640417) 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 as a sum of consecutive naturals, namely, 126820218 + 126820219.

It is an arithmetic number, because the mean of its divisors is an integer number (126820219).

Almost surely, 2^253640437 is an apocalyptic number.

It is an amenable number.

253640437 is a deficient number, since it is larger than the sum of its proper divisors (1).

253640437 is an equidigital number, since it uses as much as digits as its factorization.

253640437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 34.

The square root of 253640437 is about 15926.0929609242. The cubic root of 253640437 is about 633.0035771514.

Adding to 253640437 its reverse (734046352), we get a palindrome (987686789).

The spelling of 253640437 in words is "two hundred fifty-three million, six hundred forty thousand, four hundred thirty-seven".