1242378049 has 4 divisors (see below), whose sum is σ = 1355321520. Its totient is φ = 1129434580.

The previous prime is 1242378029. The next prime is 1242378077. The reversal of 1242378049 is 9408732421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1242378049 - 2⁹ = 1242377537 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242378029) 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, 56471719 + ... + 56471740.

It is an arithmetic number, because the mean of its divisors is an integer number (338830380).

Almost surely, 2^1242378049 is an apocalyptic number.

It is an amenable number.

1242378049 is a deficient number, since it is larger than the sum of its proper divisors (112943471).

1242378049 is a wasteful number, since it uses less digits than its factorization.

1242378049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112943470.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 1242378049 is about 35247.3835766571. The cubic root of 1242378049 is about 1075.0234136599.

The spelling of 1242378049 in words is "one billion, two hundred forty-two million, three hundred seventy-eight thousand, forty-nine".