218493047 has 4 divisors (see below), whose sum is σ = 226027320. Its totient is φ = 210958776.

The previous prime is 218493017. The next prime is 218493073. The reversal of 218493047 is 740394812.

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

It is a cyclic number.

It is not a de Polignac number, because 218493047 - 2⁶ = 218492983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 218493047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218493017) 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, 3767093 + ... + 3767150.

It is an arithmetic number, because the mean of its divisors is an integer number (56506830).

Almost surely, 2^218493047 is an apocalyptic number.

218493047 is a deficient number, since it is larger than the sum of its proper divisors (7534273).

218493047 is an equidigital number, since it uses as much as digits as its factorization.

218493047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7534272.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 218493047 is about 14781.5103084901. The cubic root of 218493047 is about 602.2995523576.

The spelling of 218493047 in words is "two hundred eighteen million, four hundred ninety-three thousand, forty-seven".