218886449 has 4 divisors (see below), whose sum is σ = 223016436. Its totient is φ = 214756464.

The previous prime is 218886431. The next prime is 218886463. The reversal of 218886449 is 944688812.

218886449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 123921424 + 94965025 = 11132^2 + 9745^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218886449 is a prime.

It is a super-2 number, since 2×218886449² = 95822555111659202, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 218886397 and 218886406.

It is not an unprimeable number, because it can be changed into a prime (218886049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2064914 + ... + 2065019.

It is an arithmetic number, because the mean of its divisors is an integer number (55754109).

Almost surely, 2^218886449 is an apocalyptic number.

It is an amenable number.

218886449 is a deficient number, since it is larger than the sum of its proper divisors (4129987).

218886449 is an equidigital number, since it uses as much as digits as its factorization.

218886449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4129986.

The product of its digits is 884736, while the sum is 50.

The square root of 218886449 is about 14794.8115567587. The cubic root of 218886449 is about 602.6608205763.

The spelling of 218886449 in words is "two hundred eighteen million, eight hundred eighty-six thousand, four hundred forty-nine".