1242004123 has 4 divisors (see below), whose sum is σ = 1275571840. Its totient is φ = 1208436408.

The previous prime is 1242004069. The next prime is 1242004133. The reversal of 1242004123 is 3214002421.

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-1242004123 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1242004123.

It is not an unprimeable number, because it can be changed into a prime (1242004133) 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, 16783803 + ... + 16783876.

It is an arithmetic number, because the mean of its divisors is an integer number (318892960).

Almost surely, 2^1242004123 is an apocalyptic number.

1242004123 is a deficient number, since it is larger than the sum of its proper divisors (33567717).

1242004123 is an equidigital number, since it uses as much as digits as its factorization.

1242004123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33567716.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1242004123 is about 35242.0788688749. The cubic root of 1242004123 is about 1074.9155507484.

Adding to 1242004123 its reverse (3214002421), we get a palindrome (4456006544).

The spelling of 1242004123 in words is "one billion, two hundred forty-two million, four thousand, one hundred twenty-three".