1243040423 has 8 divisors (see below), whose sum is σ = 1265636208. Its totient is φ = 1220595264.

The previous prime is 1243040413. The next prime is 1243040441. The reversal of 1243040423 is 3240403421.

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 1243040423 - 2¹⁴ = 1243024039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243040413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20936 + ... + 54077.

It is an arithmetic number, because the mean of its divisors is an integer number (158204526).

Almost surely, 2^1243040423 is an apocalyptic number.

1243040423 is a deficient number, since it is larger than the sum of its proper divisors (22595785).

1243040423 is an equidigital number, since it uses as much as digits as its factorization.

1243040423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75313.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 1243040423 is about 35256.7783979195. The cubic root of 1243040423 is about 1075.2144293362.

Adding to 1243040423 its reverse (3240403421), we get a palindrome (4483443844).

The spelling of 1243040423 in words is "one billion, two hundred forty-three million, forty thousand, four hundred twenty-three".