218454442 has 8 divisors (see below), whose sum is σ = 328066596. Its totient is φ = 109098912.

The previous prime is 218454407. The next prime is 218454443. The reversal of 218454442 is 244454812.

It can be written as a sum of positive squares in 2 ways, for example, as 139972561 + 78481881 = 11831^2 + 8859^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 218454398 and 218454407.

It is not an unprimeable number, because it can be changed into a prime (218454443) 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, 62013 + ... + 65440.

Almost surely, 2^218454442 is an apocalyptic number.

218454442 is a deficient number, since it is larger than the sum of its proper divisors (109612154).

218454442 is a wasteful number, since it uses less digits than its factorization.

218454442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128312.

The product of its digits is 40960, while the sum is 34.

The square root of 218454442 is about 14780.2043964216. The cubic root of 218454442 is about 602.2640773252.

The spelling of 218454442 in words is "two hundred eighteen million, four hundred fifty-four thousand, four hundred forty-two".