1281808 has 20 divisors (see below), whose sum is σ = 2709648. Its totient is φ = 582560.

The previous prime is 1281803. The next prime is 1281809. The reversal of 1281808 is 8081821.

It is not an unprimeable number, because it can be changed into a prime (1281803) 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, 3466 + ... + 3817.

2^1281808 is an apocalyptic number.

It is an amenable number.

1281808 is an abundant number, since it is smaller than the sum of its proper divisors (1427840).

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

1281808 is a wasteful number, since it uses less digits than its factorization.

1281808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7302 (or 7296 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 28.

The square root of 1281808 is about 1132.1695986026. The cubic root of 1281808 is about 108.6278021447.

It can be divided in two parts, 128 and 1808, that added together give a square (1936 = 44²).

The spelling of 1281808 in words is "one million, two hundred eighty-one thousand, eight hundred eight".