218890 has 32 divisors (see below), whose sum is σ = 466560. Its totient is φ = 72384.

The previous prime is 218887. The next prime is 218923. The reversal of 218890 is 98812.

218890 = T₂₆ + T₂₇ + ... + T₁₀₉.

218890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3681 + ... + 3739.

It is an arithmetic number, because the mean of its divisors is an integer number (14580).

2²¹⁸⁸⁹⁰ is an apocalyptic number.

218890 is an abundant number, since it is smaller than the sum of its proper divisors (247670).

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

218890 is a wasteful number, since it uses less digits than its factorization.

218890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 218890 is about 467.8568157033. The cubic root of 218890 is about 60.2664079552.

It can be divided in two parts, 2188 and 90, that added together give a triangular number (2278 = T₆₇).

The spelling of 218890 in words is "two hundred eighteen thousand, eight hundred ninety".