1242305 has 4 divisors (see below), whose sum is σ = 1490772. Its totient is φ = 993840.

The previous prime is 1242289. The next prime is 1242317. The reversal of 1242305 is 5032421.

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 322624 + 919681 = 568^2 + 959^2 .

It is not a de Polignac number, because 1242305 - 2⁴ = 1242289 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124226 + ... + 124235.

It is an arithmetic number, because the mean of its divisors is an integer number (372693).

2^1242305 is an apocalyptic number.

It is an amenable number.

1242305 is a deficient number, since it is larger than the sum of its proper divisors (248467).

1242305 is an equidigital number, since it uses as much as digits as its factorization.

1242305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248466.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 1242305 is about 1114.5873675939. The cubic root of 1242305 is about 107.5002343604.

Adding to 1242305 its reverse (5032421), we get a palindrome (6274726).

The spelling of 1242305 in words is "one million, two hundred forty-two thousand, three hundred five".