252240639 has 8 divisors (see below), whose sum is σ = 384366720. Its totient is φ = 144137496.

The previous prime is 252240619. The next prime is 252240649. The reversal of 252240639 is 936042252.

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

It is not a de Polignac number, because 252240639 - 2⁵ = 252240607 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252240619) 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, 6005709 + ... + 6005750.

It is an arithmetic number, because the mean of its divisors is an integer number (48045840).

Almost surely, 2^252240639 is an apocalyptic number.

252240639 is a deficient number, since it is larger than the sum of its proper divisors (132126081).

252240639 is a wasteful number, since it uses less digits than its factorization.

252240639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12011469.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 252240639 is about 15882.0854738916. The cubic root of 252240639 is about 631.8369490383.

The spelling of 252240639 in words is "two hundred fifty-two million, two hundred forty thousand, six hundred thirty-nine".