218806445 has 16 divisors (see below), whose sum is σ = 308472192. Its totient is φ = 146890560.

The previous prime is 218806387. The next prime is 218806457. The reversal of 218806445 is 544608812.

It is a happy number.

218806445 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 218806445 - 2¹⁰ = 218805421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 218806399 and 218806408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152297 + ... + 153726.

It is an arithmetic number, because the mean of its divisors is an integer number (19279512).

Almost surely, 2^218806445 is an apocalyptic number.

It is an amenable number.

218806445 is a deficient number, since it is larger than the sum of its proper divisors (89665747).

218806445 is a wasteful number, since it uses less digits than its factorization.

218806445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306052.

The product of its (nonzero) digits is 61440, while the sum is 38.

The square root of 218806445 is about 14792.1075239467. The cubic root of 218806445 is about 602.5873865317.

The spelling of 218806445 in words is "two hundred eighteen million, eight hundred six thousand, four hundred forty-five".