1280643 has 16 divisors (see below), whose sum is σ = 2102016. Its totient is φ = 675360.

The previous prime is 1280633. The next prime is 1280651. The reversal of 1280643 is 3460821.

It is a happy number.

It is not a de Polignac number, because 1280643 - 2⁹ = 1280131 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 2073 + ... + 2618.

It is an arithmetic number, because the mean of its divisors is an integer number (131376).

2^1280643 is an apocalyptic number.

1280643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1280643 is a deficient number, since it is larger than the sum of its proper divisors (821373).

1280643 is a wasteful number, since it uses less digits than its factorization.

1280643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4714.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 1280643 is about 1131.6549827576. The cubic root of 1280643 is about 108.5948825633.

The spelling of 1280643 in words is "one million, two hundred eighty thousand, six hundred forty-three".