1280943 has 6 divisors (see below), whose sum is σ = 1850264. Its totient is φ = 853956.

The previous prime is 1280921. The next prime is 1280947. The reversal of 1280943 is 3490821.

It is not a de Polignac number, because 1280943 - 2⁹ = 1280431 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 (1280947) 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 5 ways as a sum of consecutive naturals, for example, 71155 + ... + 71172.

2^1280943 is an apocalyptic number.

1280943 is a deficient number, since it is larger than the sum of its proper divisors (569321).

1280943 is a wasteful number, since it uses less digits than its factorization.

1280943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142333 (or 142330 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 1280943 is about 1131.7875242288. The cubic root of 1280943 is about 108.6033616167.

The spelling of 1280943 in words is "one million, two hundred eighty thousand, nine hundred forty-three".