1280423803 has 4 divisors (see below), whose sum is σ = 1280542168. Its totient is φ = 1280305440.

The previous prime is 1280423791. The next prime is 1280423821. The reversal of 1280423803 is 3083240821.

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-1280423803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1280453803) 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, 41118 + ... + 65203.

It is an arithmetic number, because the mean of its divisors is an integer number (320135542).

Almost surely, 2^1280423803 is an apocalyptic number.

1280423803 is a deficient number, since it is larger than the sum of its proper divisors (118365).

1280423803 is a wasteful number, since it uses less digits than its factorization.

1280423803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118364.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 1280423803 is about 35783.0099768032. The cubic root of 1280423803 is about 1085.8868644911.

The spelling of 1280423803 in words is "one billion, two hundred eighty million, four hundred twenty-three thousand, eight hundred three".