1280438733 has 32 divisors (see below), whose sum is σ = 2009145600. Its totient is φ = 710115840.

The previous prime is 1280438729. The next prime is 1280438743. The reversal of 1280438733 is 3378340821.

It is not a de Polignac number, because 1280438733 - 2² = 1280438729 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1280438691 and 1280438700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280438723) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 165843 + ... + 173391.

It is an arithmetic number, because the mean of its divisors is an integer number (62785800).

Almost surely, 2^1280438733 is an apocalyptic number.

It is an amenable number.

1280438733 is a deficient number, since it is larger than the sum of its proper divisors (728706867).

1280438733 is a wasteful number, since it uses less digits than its factorization.

1280438733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7797.

The product of its (nonzero) digits is 96768, while the sum is 39.

The square root of 1280438733 is about 35783.2185947547. The cubic root of 1280438733 is about 1085.8910850281.

The spelling of 1280438733 in words is "one billion, two hundred eighty million, four hundred thirty-eight thousand, seven hundred thirty-three".