1280319823 has 4 divisors (see below), whose sum is σ = 1282349488. Its totient is φ = 1278290160.

The previous prime is 1280319739. The next prime is 1280319829. The reversal of 1280319823 is 3289130821.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1280319823 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 (1280319829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1013886 + ... + 1015147.

It is an arithmetic number, because the mean of its divisors is an integer number (320587372).

Almost surely, 2^1280319823 is an apocalyptic number.

1280319823 is a deficient number, since it is larger than the sum of its proper divisors (2029665).

1280319823 is an equidigital number, since it uses as much as digits as its factorization.

1280319823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2029664.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 1280319823 is about 35781.5570231369. The cubic root of 1280319823 is about 1085.8574696474.

The spelling of 1280319823 in words is "one billion, two hundred eighty million, three hundred nineteen thousand, eight hundred twenty-three".