1242120004 has 6 divisors (see below), whose sum is σ = 2173710014. Its totient is φ = 621060000.

The previous prime is 1242120001. The next prime is 1242120023. The reversal of 1242120004 is 4000212421.

It can be written as a sum of positive squares in only one way, i.e., 1053002500 + 189117504 = 32450^2 + 13752^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1242120004.

It is not an unprimeable number, because it can be changed into a prime (1242120001) 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 as a sum of consecutive naturals, namely, 155264997 + ... + 155265004.

Almost surely, 2^1242120004 is an apocalyptic number.

It is an amenable number.

1242120004 is a deficient number, since it is larger than the sum of its proper divisors (931590010).

1242120004 is a wasteful number, since it uses less digits than its factorization.

1242120004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310530005 (or 310530003 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 1242120004 is about 35243.7229020999. The cubic root of 1242120004 is about 1074.9489801638.

Adding to 1242120004 its reverse (4000212421), we get a palindrome (5242332425).

The spelling of 1242120004 in words is "one billion, two hundred forty-two million, one hundred twenty thousand, four".