252440218 has 4 divisors (see below), whose sum is σ = 378660330. Its totient is φ = 126220108.

The previous prime is 252440197. The next prime is 252440231. The reversal of 252440218 is 812044252.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 245768329 + 6671889 = 15677^2 + 2583^2 .

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 as a sum of consecutive naturals, namely, 63110053 + ... + 63110056.

Almost surely, 2^252440218 is an apocalyptic number.

252440218 is a deficient number, since it is larger than the sum of its proper divisors (126220112).

252440218 is a wasteful number, since it uses less digits than its factorization.

252440218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126220111.

The product of its (nonzero) digits is 5120, while the sum is 28.

The square root of 252440218 is about 15888.3673799418. The cubic root of 252440218 is about 632.0035467541.

The spelling of 252440218 in words is "two hundred fifty-two million, four hundred forty thousand, two hundred eighteen".