1242809 has 8 divisors (see below), whose sum is σ = 1320000. Its totient is φ = 1166832.

The previous prime is 1242803. The next prime is 1242811. The reversal of 1242809 is 9082421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2612 + ... + 3050.

It is an arithmetic number, because the mean of its divisors is an integer number (165000).

2^1242809 is an apocalyptic number.

1242809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1242809 is a deficient number, since it is larger than the sum of its proper divisors (77191).

1242809 is a wasteful number, since it uses less digits than its factorization.

1242809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 1242809 is about 1114.8134373069. The cubic root of 1242809 is about 107.5147699194.

The spelling of 1242809 in words is "one million, two hundred forty-two thousand, eight hundred nine".