252640422 has 24 divisors (see below), whose sum is σ = 549267264. Its totient is φ = 83924304.

The previous prime is 252640391. The next prime is 252640429. The reversal of 252640422 is 224046252.

It is a happy number.

252640422 is a `hidden beast` number, since 252 + 6 + 404 + 2 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252640429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18678 + ... + 29225.

It is an arithmetic number, because the mean of its divisors is an integer number (22886136).

Almost surely, 2^252640422 is an apocalyptic number.

252640422 is an abundant number, since it is smaller than the sum of its proper divisors (296626842).

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

252640422 is a wasteful number, since it uses less digits than its factorization.

252640422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48204 (or 48201 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 252640422 is about 15894.6664639432. Note that the first 3 decimals coincide. The cubic root of 252640422 is about 632.1705779885.

Adding to 252640422 its reverse (224046252), we get a palindrome (476686674).

The spelling of 252640422 in words is "two hundred fifty-two million, six hundred forty thousand, four hundred twenty-two".