1280609 has 8 divisors (see below), whose sum is σ = 1427328. Its totient is φ = 1138960.

The previous prime is 1280603. The next prime is 1280623. The reversal of 1280609 is 9060821.

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-1280609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1280603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 722 + ... + 1755.

It is an arithmetic number, because the mean of its divisors is an integer number (178416).

2^1280609 is an apocalyptic number.

It is an amenable number.

1280609 is a deficient number, since it is larger than the sum of its proper divisors (146719).

1280609 is a wasteful number, since it uses less digits than its factorization.

1280609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2535.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 1280609 is about 1131.6399604114. The cubic root of 1280609 is about 108.5939215204.

The spelling of 1280609 in words is "one million, two hundred eighty thousand, six hundred nine".