252621306 has 24 divisors (see below), whose sum is σ = 625538784. Its totient is φ = 72177480.

The previous prime is 252621277. The next prime is 252621323. The reversal of 252621306 is 603126252.

252621306 is a `hidden beast` number, since 2 + 5 + 2 + 621 + 30 + 6 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 252621306.

It is an unprimeable number.

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, 1002340 + ... + 1002591.

It is an arithmetic number, because the mean of its divisors is an integer number (26064116).

Almost surely, 2^252621306 is an apocalyptic number.

252621306 is an abundant number, since it is smaller than the sum of its proper divisors (372917478).

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

252621306 is a wasteful number, since it uses less digits than its factorization.

252621306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2004946 (or 2004943 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 252621306 is about 15894.0651187794. The cubic root of 252621306 is about 632.1546332220.

Adding to 252621306 its reverse (603126252), we get a palindrome (855747558).

It can be divided in two parts, 2526 and 21306, that added together give a palindrome (23832).

The spelling of 252621306 in words is "two hundred fifty-two million, six hundred twenty-one thousand, three hundred six".