1281365 has 8 divisors (see below), whose sum is σ = 1590840. Its totient is φ = 989632.

The previous prime is 1281349. The next prime is 1281367. The reversal of 1281365 is 5631821.

It can be written as a sum of positive squares in 4 ways, for example, as 552049 + 729316 = 743^2 + 854^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1281365 - 2⁴ = 1281349 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 4274 + ... + 4563.

It is an arithmetic number, because the mean of its divisors is an integer number (198855).

2^1281365 is an apocalyptic number.

It is an amenable number.

1281365 is a deficient number, since it is larger than the sum of its proper divisors (309475).

1281365 is an equidigital number, since it uses as much as digits as its factorization.

1281365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8871.

The product of its digits is 1440, while the sum is 26.

The square root of 1281365 is about 1131.9739396294. The cubic root of 1281365 is about 108.6152865779.

The spelling of 1281365 in words is "one million, two hundred eighty-one thousand, three hundred sixty-five".