1280539722 has 128 divisors (see below), whose sum is σ = 3453788160. Its totient is φ = 306293760.

The previous prime is 1280539721. The next prime is 1280539783. The reversal of 1280539722 is 2279350821.

It is not an unprimeable number, because it can be changed into a prime (1280539721) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 367404 + ... + 370872.

It is an arithmetic number, because the mean of its divisors is an integer number (26982720).

Almost surely, 2^1280539722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1280539722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1726894080).

1280539722 is an abundant number, since it is smaller than the sum of its proper divisors (2173248438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1280539722 is a wasteful number, since it uses less digits than its factorization.

1280539722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3556.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 1280539722 is about 35784.6296892954. The cubic root of 1280539722 is about 1085.9196325795.

The spelling of 1280539722 in words is "one billion, two hundred eighty million, five hundred thirty-nine thousand, seven hundred twenty-two".