1242320423 has 4 divisors (see below), whose sum is σ = 1251258120. Its totient is φ = 1233382728.

The previous prime is 1242320411. The next prime is 1242320447. The reversal of 1242320423 is 3240232421.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242320423 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 (1242320483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4468640 + ... + 4468917.

It is an arithmetic number, because the mean of its divisors is an integer number (312814530).

Almost surely, 2^1242320423 is an apocalyptic number.

1242320423 is a deficient number, since it is larger than the sum of its proper divisors (8937697).

1242320423 is an equidigital number, since it uses as much as digits as its factorization.

1242320423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8937696.

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

The square root of 1242320423 is about 35246.5661164318. The cubic root of 1242320423 is about 1075.0067922412.

Adding to 1242320423 its reverse (3240232421), we get a palindrome (4482552844).

The spelling of 1242320423 in words is "one billion, two hundred forty-two million, three hundred twenty thousand, four hundred twenty-three".