1280632321 has 8 divisors (see below), whose sum is σ = 1387498464. Its totient is φ = 1177270080.

The previous prime is 1280632291. The next prime is 1280632337. The reversal of 1280632321 is 1232360821.

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

It is a cyclic number.

It is not a de Polignac number, because 1280632321 - 2⁹ = 1280631809 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1280632321.

It is not an unprimeable number, because it can be changed into a prime (1280632361) 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, 875215 + ... + 876676.

It is an arithmetic number, because the mean of its divisors is an integer number (173437308).

Almost surely, 2^1280632321 is an apocalyptic number.

It is an amenable number.

1280632321 is a deficient number, since it is larger than the sum of its proper divisors (106866143).

1280632321 is a wasteful number, since it uses less digits than its factorization.

1280632321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1751951.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1280632321 is about 35785.9235035230. The cubic root of 1280632321 is about 1085.9458071284.

The spelling of 1280632321 in words is "one billion, two hundred eighty million, six hundred thirty-two thousand, three hundred twenty-one".