252021644 has 12 divisors (see below), whose sum is σ = 504043344. Its totient is φ = 108009264.

The previous prime is 252021641. The next prime is 252021659. The reversal of 252021644 is 446120252.

252021644 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (252021641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4500359 + ... + 4500414.

It is an arithmetic number, because the mean of its divisors is an integer number (42003612).

Almost surely, 2^252021644 is an apocalyptic number.

It is an amenable number.

252021644 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

252021644 is a wasteful number, since it uses less digits than its factorization.

252021644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9000784 (or 9000782 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 252021644 is about 15875.1895736712. The cubic root of 252021644 is about 631.6540427515.

Adding to 252021644 its reverse (446120252), we get a palindrome (698141896).

The spelling of 252021644 in words is "two hundred fifty-two million, twenty-one thousand, six hundred forty-four".