1281243 has 4 divisors (see below), whose sum is σ = 1708328. Its totient is φ = 854160.

The previous prime is 1281229. The next prime is 1281253. The reversal of 1281243 is 3421821.

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

It is not a de Polignac number, because 1281243 - 2⁵ = 1281211 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1281253) 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, 213538 + ... + 213543.

It is an arithmetic number, because the mean of its divisors is an integer number (427082).

2^1281243 is an apocalyptic number.

1281243 is a deficient number, since it is larger than the sum of its proper divisors (427085).

1281243 is an equidigital number, since it uses as much as digits as its factorization.

1281243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427084.

The product of its digits is 384, while the sum is 21.

The square root of 1281243 is about 1131.9200501802. The cubic root of 1281243 is about 108.6118393463.

The spelling of 1281243 in words is "one million, two hundred eighty-one thousand, two hundred forty-three".