1280385722 has 64 divisors (see below), whose sum is σ = 2448230400. Its totient is φ = 487788480.

The previous prime is 1280385709. The next prime is 1280385749. The reversal of 1280385722 is 2275830821.

It is a super-2 number, since 2×1280385722² = 3278775194202922568, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1392779 + ... + 1393697.

It is an arithmetic number, because the mean of its divisors is an integer number (38253600).

Almost surely, 2^1280385722 is an apocalyptic number.

1280385722 is a deficient number, since it is larger than the sum of its proper divisors (1167844678).

1280385722 is a wasteful number, since it uses less digits than its factorization.

1280385722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1131.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 1280385722 is about 35782.4778627752. The cubic root of 1280385722 is about 1085.8760992879.

The spelling of 1280385722 in words is "one billion, two hundred eighty million, three hundred eighty-five thousand, seven hundred twenty-two".