1280345798 has 4 divisors (see below), whose sum is σ = 1920518700. Its totient is φ = 640172898.

The previous prime is 1280345797. The next prime is 1280345809. The reversal of 1280345798 is 8975430821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8975430821 = 7 ⋅1282204403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280345797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320086448 + ... + 320086451.

It is an arithmetic number, because the mean of its divisors is an integer number (480129675).

Almost surely, 2^1280345798 is an apocalyptic number.

1280345798 is a deficient number, since it is larger than the sum of its proper divisors (640172902).

1280345798 is an equidigital number, since it uses as much as digits as its factorization.

1280345798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640172901.

The product of its (nonzero) digits is 483840, while the sum is 47.

The square root of 1280345798 is about 35781.9199876139. The cubic root of 1280345798 is about 1085.8648128536.

The spelling of 1280345798 in words is "one billion, two hundred eighty million, three hundred forty-five thousand, seven hundred ninety-eight".