1243273047 has 4 divisors (see below), whose sum is σ = 1657697400. Its totient is φ = 828848696.

The previous prime is 1243273033. The next prime is 1243273067. The reversal of 1243273047 is 7403723421.

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 1243273047 - 2⁶ = 1243272983 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1243272999 and 1243273017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243273067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207212172 + ... + 207212177.

It is an arithmetic number, because the mean of its divisors is an integer number (414424350).

Almost surely, 2^1243273047 is an apocalyptic number.

1243273047 is a deficient number, since it is larger than the sum of its proper divisors (414424353).

1243273047 is an equidigital number, since it uses as much as digits as its factorization.

1243273047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414424352.

The product of its (nonzero) digits is 28224, while the sum is 33.

The square root of 1243273047 is about 35260.0772404145. The cubic root of 1243273047 is about 1075.2814974368.

Adding to 1243273047 its reverse (7403723421), we get a palindrome (8646996468).

The spelling of 1243273047 in words is "one billion, two hundred forty-three million, two hundred seventy-three thousand, forty-seven".