1280065 has 8 divisors (see below), whose sum is σ = 1603008. Its totient is φ = 979440.

The previous prime is 1280023. The next prime is 1280101. The reversal of 1280065 is 5600821.

It is a happy number.

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

It is not a de Polignac number, because 1280065 - 2⁷ = 1279937 is a prime.

It is an Ulam number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5451 + ... + 5680.

It is an arithmetic number, because the mean of its divisors is an integer number (200376).

2^1280065 is an apocalyptic number.

It is an amenable number.

1280065 is a deficient number, since it is larger than the sum of its proper divisors (322943).

1280065 is a wasteful number, since it uses less digits than its factorization.

1280065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11159.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 1280065 is about 1131.3995757468. The cubic root of 1280065 is about 108.5785425196.

Adding to 1280065 its reverse (5600821), we get a palindrome (6880886).

The spelling of 1280065 in words is "one million, two hundred eighty thousand, sixty-five".