1242709 has 8 divisors (see below), whose sum is σ = 1352120. Its totient is φ = 1135296.

The previous prime is 1242643. The next prime is 1242739. The reversal of 1242709 is 9072421.

It can be written as a sum of positive squares in 4 ways, for example, as 272484 + 970225 = 522^2 + 985^2 .

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 1242709 - 2¹³ = 1234517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242739) by changing a digit.

It is a Zeisel number, with parameters (8, 5).

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 979 + ... + 1855.

It is an arithmetic number, because the mean of its divisors is an integer number (169015).

2^1242709 is an apocalyptic number.

It is an amenable number.

1242709 is a deficient number, since it is larger than the sum of its proper divisors (109411).

1242709 is a wasteful number, since it uses less digits than its factorization.

1242709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 1242709 is about 1114.7685858509. The cubic root of 1242709 is about 107.5118861925.

The spelling of 1242709 in words is "one million, two hundred forty-two thousand, seven hundred nine".