1280723 has 4 divisors (see below), whose sum is σ = 1288560. Its totient is φ = 1272888.

The previous prime is 1280707. The next prime is 1280737. The reversal of 1280723 is 3270821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1280723 - 2⁴ = 1280707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1280743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3668 + ... + 4001.

It is an arithmetic number, because the mean of its divisors is an integer number (322140).

2^1280723 is an apocalyptic number.

1280723 is a deficient number, since it is larger than the sum of its proper divisors (7837).

1280723 is an equidigital number, since it uses as much as digits as its factorization.

1280723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7836.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 1280723 is about 1131.6903286677. The cubic root of 1280723 is about 108.5971437737.

The spelling of 1280723 in words is "one million, two hundred eighty thousand, seven hundred twenty-three".