1281868 has 24 divisors (see below), whose sum is σ = 2715552. Its totient is φ = 516864.

The previous prime is 1281853. The next prime is 1281871. The reversal of 1281868 is 8681821.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 871 + ... + 1822.

It is an arithmetic number, because the mean of its divisors is an integer number (113148).

2^1281868 is an apocalyptic number.

It is an amenable number.

1281868 is an abundant number, since it is smaller than the sum of its proper divisors (1433684).

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

1281868 is a wasteful number, since it uses less digits than its factorization.

1281868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2721 (or 2719 counting only the distinct ones).

The product of its digits is 6144, while the sum is 34.

The square root of 1281868 is about 1132.1960960894. The cubic root of 1281868 is about 108.6294970336.

The spelling of 1281868 in words is "one million, two hundred eighty-one thousand, eight hundred sixty-eight".