1216243 has 8 divisors (see below), whose sum is σ = 1397088. Its totient is φ = 1037184.

The previous prime is 1216213. The next prime is 1216249. The reversal of 1216243 is 3426121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1216243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1216243.

It is not an unprimeable number, because it can be changed into a prime (1216249) 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, 1755 + ... + 2347.

It is an arithmetic number, because the mean of its divisors is an integer number (174636).

2^1216243 is an apocalyptic number.

1216243 is a deficient number, since it is larger than the sum of its proper divisors (180845).

1216243 is an equidigital number, since it uses as much as digits as its factorization.

1216243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893.

The product of its digits is 288, while the sum is 19.

The square root of 1216243 is about 1102.8340763687. The cubic root of 1216243 is about 106.7431753613.

The spelling of 1216243 in words is "one million, two hundred sixteen thousand, two hundred forty-three".