243215 has 8 divisors (see below), whose sum is σ = 333600. Its totient is φ = 166752.

The previous prime is 243209. The next prime is 243227. The reversal of 243215 is 512342.

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 243215 - 2¹² = 239119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243193 and 243202.

It is a congruent number.

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, 3440 + ... + 3509.

It is an arithmetic number, because the mean of its divisors is an integer number (41700).

2²⁴³²¹⁵ is an apocalyptic number.

243215 is a deficient number, since it is larger than the sum of its proper divisors (90385).

243215 is an equidigital number, since it uses as much as digits as its factorization.

243215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6961.

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

The square root of 243215 is about 493.1683282613. The cubic root of 243215 is about 62.4209133002.

Adding to 243215 its reverse (512342), we get a palindrome (755557).

The spelling of 243215 in words is "two hundred forty-three thousand, two hundred fifteen".