1242309 has 8 divisors (see below), whose sum is σ = 1753920. Its totient is φ = 779456.

The previous prime is 1242289. The next prime is 1242317. The reversal of 1242309 is 9032421.

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 1242309 - 2⁷ = 1242181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242359) by changing a digit.

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, 12129 + ... + 12230.

It is an arithmetic number, because the mean of its divisors is an integer number (219240).

2^1242309 is an apocalyptic number.

It is an amenable number.

1242309 is a deficient number, since it is larger than the sum of its proper divisors (511611).

1242309 is a wasteful number, since it uses less digits than its factorization.

1242309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24379.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1242309 is about 1114.5891619785. The cubic root of 1242309 is about 107.5003497375.

It can be divided in two parts, 1242 and 309, that added together give a palindrome (1551).

The spelling of 1242309 in words is "one million, two hundred forty-two thousand, three hundred nine".