1217245 has 8 divisors (see below), whose sum is σ = 1472184. Its totient is φ = 966144.

The previous prime is 1217233. The next prime is 1217261. The reversal of 1217245 is 5427121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 158404 + 1058841 = 398^2 + 1029^2 .

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 1217245 - 2⁵ = 1217213 is a prime.

It is a Duffinian number.

1217245 is a lucky number.

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, 204 + ... + 1573.

It is an arithmetic number, because the mean of its divisors is an integer number (184023).

2^1217245 is an apocalyptic number.

It is an amenable number.

1217245 is a deficient number, since it is larger than the sum of its proper divisors (254939).

1217245 is a wasteful number, since it uses less digits than its factorization.

1217245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1919.

The product of its digits is 560, while the sum is 22.

The square root of 1217245 is about 1103.2882669547. The cubic root of 1217245 is about 106.7724807175.

The spelling of 1217245 in words is "one million, two hundred seventeen thousand, two hundred forty-five".