218444489 has 4 divisors (see below), whose sum is σ = 219542400. Its totient is φ = 217346580.

The previous prime is 218444483. The next prime is 218444503. The reversal of 218444489 is 984444812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218444489 is a prime.

It is a super-2 number, since 2×218444489² = 95435989548942242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218444483) 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, 548657 + ... + 549054.

It is an arithmetic number, because the mean of its divisors is an integer number (54885600).

Almost surely, 2^218444489 is an apocalyptic number.

It is an amenable number.

218444489 is a deficient number, since it is larger than the sum of its proper divisors (1097911).

218444489 is a wasteful number, since it uses less digits than its factorization.

218444489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097910.

The product of its digits is 294912, while the sum is 44.

The square root of 218444489 is about 14779.8676922359. The cubic root of 218444489 is about 602.2549306043.

The spelling of 218444489 in words is "two hundred eighteen million, four hundred forty-four thousand, four hundred eighty-nine".