1280520723 has 32 divisors (see below), whose sum is σ = 1813723200. Its totient is φ = 802368000.

The previous prime is 1280520707. The next prime is 1280520737. The reversal of 1280520723 is 3270250821.

It is not a de Polignac number, because 1280520723 - 2⁴ = 1280520707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1280520743) 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 31 ways as a sum of consecutive naturals, for example, 534813 + ... + 537201.

It is an arithmetic number, because the mean of its divisors is an integer number (56678850).

Almost surely, 2^1280520723 is an apocalyptic number.

1280520723 is a deficient number, since it is larger than the sum of its proper divisors (533202477).

1280520723 is a wasteful number, since it uses less digits than its factorization.

1280520723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2583.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 1280520723 is about 35784.3642251752. The cubic root of 1280520723 is about 1085.9142620604.

The spelling of 1280520723 in words is "one billion, two hundred eighty million, five hundred twenty thousand, seven hundred twenty-three".