1215243 has 14 divisors (see below), whose sum is σ = 1823124. Its totient is φ = 809676.

The previous prime is 1215239. The next prime is 1215271. The reversal of 1215243 is 3425121.

It is not a de Polignac number, because 1215243 - 2² = 1215239 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1215283) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 105 + ... + 1562.

2^1215243 is an apocalyptic number.

1215243 is a deficient number, since it is larger than the sum of its proper divisors (607881).

1215243 is an frugal number, since it uses more digits than its factorization.

1215243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1685 (or 1670 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 1215243 is about 1102.3806057801. The cubic root of 1215243 is about 106.7139124471.

The spelling of 1215243 in words is "one million, two hundred fifteen thousand, two hundred forty-three".