1281366 has 32 divisors (see below), whose sum is σ = 2901600. Its totient is φ = 419040.

The previous prime is 1281349. The next prime is 1281367. The reversal of 1281366 is 6631821.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281367) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3100 + ... + 3488.

It is an arithmetic number, because the mean of its divisors is an integer number (90675).

2^1281366 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1281366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1450800).

1281366 is an abundant number, since it is smaller than the sum of its proper divisors (1620234).

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

1281366 is a wasteful number, since it uses less digits than its factorization.

1281366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461 (or 455 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 1281366 is about 1131.9743813355. The cubic root of 1281366 is about 108.6153148330.

The spelling of 1281366 in words is "one million, two hundred eighty-one thousand, three hundred sixty-six".