218442573 has 6 divisors (see below), whose sum is σ = 315528174. Its totient is φ = 145628376.

The previous prime is 218442551. The next prime is 218442583. The reversal of 218442573 is 375244812.

It is a happy number.

218442573 is a `hidden beast` number, since 2 + 1 + 84 + 4 + 2 + 573 = 666.

It can be written as a sum of positive squares in only one way, i.e., 207273609 + 11168964 = 14397^2 + 3342^2 .

It is not a de Polignac number, because 218442573 - 2⁸ = 218442317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218442583) 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 5 ways as a sum of consecutive naturals, for example, 12135690 + ... + 12135707.

It is an arithmetic number, because the mean of its divisors is an integer number (52588029).

Almost surely, 2^218442573 is an apocalyptic number.

It is an amenable number.

218442573 is a deficient number, since it is larger than the sum of its proper divisors (97085601).

218442573 is a wasteful number, since it uses less digits than its factorization.

218442573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24271403 (or 24271400 counting only the distinct ones).

The product of its digits is 53760, while the sum is 36.

The square root of 218442573 is about 14779.8028741929. The cubic root of 218442573 is about 602.2531697850.

The spelling of 218442573 in words is "two hundred eighteen million, four hundred forty-two thousand, five hundred seventy-three".