1247143 has 4 divisors (see below), whose sum is σ = 1270728. Its totient is φ = 1223560.

The previous prime is 1247119. The next prime is 1247167. The reversal of 1247143 is 3417421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3417421 = 7 ⋅488203.

It is an interprime number because it is at equal distance from previous prime (1247119) and next prime (1247167).

It is a cyclic number.

It is not a de Polignac number, because 1247143 - 2⁹ = 1246631 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247243) 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 3 ways as a sum of consecutive naturals, for example, 11713 + ... + 11818.

It is an arithmetic number, because the mean of its divisors is an integer number (317682).

2^1247143 is an apocalyptic number.

1247143 is a deficient number, since it is larger than the sum of its proper divisors (23585).

1247143 is an equidigital number, since it uses as much as digits as its factorization.

1247143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23584.

The product of its digits is 672, while the sum is 22.

The square root of 1247143 is about 1116.7555686004. The cubic root of 1247143 is about 107.6396022972.

The spelling of 1247143 in words is "one million, two hundred forty-seven thousand, one hundred forty-three".