218090 has 16 divisors (see below), whose sum is σ = 398088. Its totient is φ = 86016.

The previous prime is 218087. The next prime is 218107. The reversal of 218090 is 90812.

It is a Cunningham number, because it is equal to 467²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 78961 + 139129 = 281^2 + 373^2 .

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 218090.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1034 + ... + 1226.

2²¹⁸⁰⁹⁰ is an apocalyptic number.

218090 is a deficient number, since it is larger than the sum of its proper divisors (179998).

218090 is a wasteful number, since it uses less digits than its factorization.

218090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 218090 is about 467.0010706626. The cubic root of 218090 is about 60.1928976952.

The spelling of 218090 in words is "two hundred eighteen thousand, ninety".