252138415 has 8 divisors (see below), whose sum is σ = 303200640. Its totient is φ = 201287712.

The previous prime is 252138413. The next prime is 252138421. The reversal of 252138415 is 514831252.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 252138415 - 2¹ = 252138413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252138413) 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 7 ways as a sum of consecutive naturals, for example, 50244 + ... + 55033.

It is an arithmetic number, because the mean of its divisors is an integer number (37900080).

Almost surely, 2^252138415 is an apocalyptic number.

252138415 is a deficient number, since it is larger than the sum of its proper divisors (51062225).

252138415 is a wasteful number, since it uses less digits than its factorization.

252138415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105761.

The product of its digits is 9600, while the sum is 31.

The square root of 252138415 is about 15878.8669306094. The cubic root of 252138415 is about 631.7515839577.

Adding to 252138415 its reverse (514831252), we get a palindrome (766969667).

The spelling of 252138415 in words is "two hundred fifty-two million, one hundred thirty-eight thousand, four hundred fifteen".