210890 has 8 divisors (see below), whose sum is σ = 379620. Its totient is φ = 84352.

The previous prime is 210869. The next prime is 210901. The reversal of 210890 is 98012.

210890 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 196249 + 14641 = 443^2 + 121^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 11.

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 3 ways as a sum of consecutive naturals, for example, 10535 + ... + 10554.

2²¹⁰⁸⁹⁰ is an apocalyptic number.

210890 is a deficient number, since it is larger than the sum of its proper divisors (168730).

210890 is a wasteful number, since it uses less digits than its factorization.

210890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21096.

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

The square root of 210890 is about 459.2276124102. The cubic root of 210890 is about 59.5230708734.

The spelling of 210890 in words is "two hundred ten thousand, eight hundred ninety".