1215245 has 18 divisors (see below), whose sum is σ = 1604382. Its totient is φ = 883456.

The previous prime is 1215239. The next prime is 1215271. The reversal of 1215245 is 5425121.

It can be written as a sum of positive squares in 9 ways, for example, as 24964 + 1190281 = 158^2 + 1091^2 .

It is not a de Polignac number, because 1215245 - 2⁴ = 1215229 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 41891 + ... + 41919.

2^1215245 is an apocalyptic number.

It is an amenable number.

1215245 is a deficient number, since it is larger than the sum of its proper divisors (389137).

1215245 is an equidigital number, since it uses as much as digits as its factorization.

1215245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97 (or 51 counting only the distinct ones).

The product of its digits is 400, while the sum is 20.

The square root of 1215245 is about 1102.3815129074. The cubic root of 1215245 is about 106.7139709890.

Multiplying 1215245 by its sum of digits (20), we get a square (24304900 = 4930²).

The spelling of 1215245 in words is "one million, two hundred fifteen thousand, two hundred forty-five".