218689452 has 18 divisors (see below), whose sum is σ = 552798428. Its totient is φ = 72896472.

The previous prime is 218689433. The next prime is 218689477. The reversal of 218689452 is 254986812.

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 218689398 and 218689407.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3037318 + ... + 3037389.

Almost surely, 2^218689452 is an apocalyptic number.

It is an amenable number.

218689452 is an abundant number, since it is smaller than the sum of its proper divisors (334108976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218689452 is a wasteful number, since it uses less digits than its factorization.

218689452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6074717 (or 6074712 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 218689452 is about 14788.1524200963. The cubic root of 218689452 is about 602.4799688020.

The spelling of 218689452 in words is "two hundred eighteen million, six hundred eighty-nine thousand, four hundred fifty-two".