1280449916 has 12 divisors (see below), whose sum is σ = 2313071040. Its totient is φ = 619572480.

The previous prime is 1280449903. The next prime is 1280449921. The reversal of 1280449916 is 6199440821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5162981 + ... + 5163228.

It is an arithmetic number, because the mean of its divisors is an integer number (192755920).

Almost surely, 2^1280449916 is an apocalyptic number.

It is an amenable number.

1280449916 is a deficient number, since it is larger than the sum of its proper divisors (1032621124).

1280449916 is a wasteful number, since it uses less digits than its factorization.

1280449916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10326244 (or 10326242 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 1280449916 is about 35783.3748548121. The cubic root of 1280449916 is about 1085.8942463103.

The spelling of 1280449916 in words is "one billion, two hundred eighty million, four hundred forty-nine thousand, nine hundred sixteen".