1281347 has 4 divisors (see below), whose sum is σ = 1316016. Its totient is φ = 1246680.

The previous prime is 1281331. The next prime is 1281349. The reversal of 1281347 is 7431821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1281347 - 2⁴ = 1281331 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1281349) 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, 17279 + ... + 17352.

It is an arithmetic number, because the mean of its divisors is an integer number (329004).

2^1281347 is an apocalyptic number.

1281347 is a deficient number, since it is larger than the sum of its proper divisors (34669).

1281347 is an equidigital number, since it uses as much as digits as its factorization.

1281347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34668.

The product of its digits is 1344, while the sum is 26.

The square root of 1281347 is about 1131.9659888884. The cubic root of 1281347 is about 108.6147779837.

The spelling of 1281347 in words is "one million, two hundred eighty-one thousand, three hundred forty-seven".