1280445123 has 8 divisors (see below), whose sum is σ = 1709917888. Its totient is φ = 852301224.

The previous prime is 1280445097. The next prime is 1280445137. The reversal of 1280445123 is 3215440821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1280445123 - 2¹³ = 1280436931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1280445163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 329965 + ... + 333822.

It is an arithmetic number, because the mean of its divisors is an integer number (213739736).

Almost surely, 2^1280445123 is an apocalyptic number.

1280445123 is a deficient number, since it is larger than the sum of its proper divisors (429472765).

1280445123 is an equidigital number, since it uses as much as digits as its factorization.

1280445123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664433.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 1280445123 is about 35783.3078823074. The cubic root of 1280445123 is about 1085.8928913966.

Adding to 1280445123 its reverse (3215440821), we get a palindrome (4495885944).

The spelling of 1280445123 in words is "one billion, two hundred eighty million, four hundred forty-five thousand, one hundred twenty-three".