1280788 has 12 divisors (see below), whose sum is σ = 2265172. Its totient is φ = 633600.

The previous prime is 1280767. The next prime is 1280789. The reversal of 1280788 is 8870821.

It can be written as a sum of positive squares in 2 ways, for example, as 412164 + 868624 = 642^2 + 932^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1263 + ... + 2038.

2^1280788 is an apocalyptic number.

It is an amenable number.

1280788 is a deficient number, since it is larger than the sum of its proper divisors (984384).

1280788 is a wasteful number, since it uses less digits than its factorization.

1280788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3402 (or 3400 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 34.

The square root of 1280788 is about 1131.7190464068. The cubic root of 1280788 is about 108.5989809377.

The spelling of 1280788 in words is "one million, two hundred eighty thousand, seven hundred eighty-eight".