215090 has 16 divisors (see below), whose sum is σ = 392472. Its totient is φ = 84864.

The previous prime is 215087. The next prime is 215123. The reversal of 215090 is 90512.

215090 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 4 ways, for example, as 160801 + 54289 = 401^2 + 233^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1292 + ... + 1448.

2²¹⁵⁰⁹⁰ is an apocalyptic number.

215090 is a deficient number, since it is larger than the sum of its proper divisors (177382).

215090 is a wasteful number, since it uses less digits than its factorization.

215090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 215090 is about 463.7779641165. Note that the first 3 decimals coincide. The cubic root of 215090 is about 59.9156221360.

The spelling of 215090 in words is "two hundred fifteen thousand, ninety".