1281864 has 16 divisors (see below), whose sum is σ = 3204720. Its totient is φ = 427280.

The previous prime is 1281853. The next prime is 1281871. The reversal of 1281864 is 4681821.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26682 + ... + 26729.

It is an arithmetic number, because the mean of its divisors is an integer number (200295).

2^1281864 is an apocalyptic number.

It is an amenable number.

1281864 is an abundant number, since it is smaller than the sum of its proper divisors (1922856).

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

1281864 is a wasteful number, since it uses less digits than its factorization.

1281864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53420 (or 53416 counting only the distinct ones).

The product of its digits is 3072, while the sum is 30.

The square root of 1281864 is about 1132.1943296095. The cubic root of 1281864 is about 108.6293840427.

It can be divided in two parts, 1281 and 864, that added together give a triangular number (2145 = T₆₅).

The spelling of 1281864 in words is "one million, two hundred eighty-one thousand, eight hundred sixty-four".