215243 has 8 divisors (see below), whose sum is σ = 249312. Its totient is φ = 182016.

The previous prime is 215239. The next prime is 215249. The reversal of 215243 is 342512.

215243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 215243 - 2² = 215239 is a prime.

It is a super-3 number, since 3×215243³ = 29916333377861721, which contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (215249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 521 + ... + 837.

It is an arithmetic number, because the mean of its divisors is an integer number (31164).

2²¹⁵²⁴³ is an apocalyptic number.

215243 is a deficient number, since it is larger than the sum of its proper divisors (34069).

215243 is an equidigital number, since it uses as much as digits as its factorization.

215243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421.

The product of its digits is 240, while the sum is 17.

The square root of 215243 is about 463.9428844157. The cubic root of 215243 is about 59.9298253647.

Adding to 215243 its reverse (342512), we get a palindrome (557755).

The spelling of 215243 in words is "two hundred fifteen thousand, two hundred forty-three".