252405530 has 32 divisors (see below), whose sum is σ = 495999504. Its totient is φ = 91915776.

The previous prime is 252405509. The next prime is 252405533. The reversal of 252405530 is 35504252.

It can be written as a sum of positive squares in 8 ways, for example, as 126270169 + 126135361 = 11237^2 + 11231^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 252405530.

It is not an unprimeable number, because it can be changed into a prime (252405533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3809 + ... + 22788.

Almost surely, 2^252405530 is an apocalyptic number.

252405530 is a deficient number, since it is larger than the sum of its proper divisors (243593974).

252405530 is a wasteful number, since it uses less digits than its factorization.

252405530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26690.

The product of its (nonzero) digits is 6000, while the sum is 26.

The square root of 252405530 is about 15887.2757261904. The cubic root of 252405530 is about 631.9745974007.

Adding to 252405530 its reverse (35504252), we get a palindrome (287909782).

The spelling of 252405530 in words is "two hundred fifty-two million, four hundred five thousand, five hundred thirty".