218449590 has 16 divisors (see below), whose sum is σ = 524279088. Its totient is φ = 58253216.

The previous prime is 218449579. The next prime is 218449597. The reversal of 218449590 is 95944812.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218449597) 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 7 ways as a sum of consecutive naturals, for example, 3640797 + ... + 3640856.

It is an arithmetic number, because the mean of its divisors is an integer number (32767443).

Almost surely, 2^218449590 is an apocalyptic number.

218449590 is an abundant number, since it is smaller than the sum of its proper divisors (305829498).

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

218449590 is a wasteful number, since it uses less digits than its factorization.

218449590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7281663.

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 218449590 is about 14780.0402570494. The cubic root of 218449590 is about 602.2596184139.

The spelling of 218449590 in words is "two hundred eighteen million, four hundred forty-nine thousand, five hundred ninety".