1247245 has 4 divisors (see below), whose sum is σ = 1496700. Its totient is φ = 997792.

The previous prime is 1247243. The next prime is 1247263. The reversal of 1247245 is 5427421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 820836 + 426409 = 906^2 + 653^2 .

It is a cyclic number.

It is not a de Polignac number, because 1247245 - 2¹ = 1247243 is a prime.

It is a d-powerful number, because it can be written as 1 + 2¹¹ + 4⁸ + 7 + 2¹⁷ + 4¹⁰ + 5 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124720 + ... + 124729.

It is an arithmetic number, because the mean of its divisors is an integer number (374175).

2^1247245 is an apocalyptic number.

It is an amenable number.

1247245 is a deficient number, since it is larger than the sum of its proper divisors (249455).

1247245 is an equidigital number, since it uses as much as digits as its factorization.

1247245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249454.

The product of its digits is 2240, while the sum is 25.

The square root of 1247245 is about 1116.8012356727. The cubic root of 1247245 is about 107.6425367215.

The spelling of 1247245 in words is "one million, two hundred forty-seven thousand, two hundred forty-five".