1242123042 has 32 divisors (see below), whose sum is σ = 2502503424. Its totient is φ = 411008000.

The previous prime is 1242123023. The next prime is 1242123049. The reversal of 1242123042 is 2403212421.

It is not an unprimeable number, because it can be changed into a prime (1242123049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 775042 + ... + 776642.

It is an arithmetic number, because the mean of its divisors is an integer number (78203232).

Almost surely, 2^1242123042 is an apocalyptic number.

1242123042 is an abundant number, since it is smaller than the sum of its proper divisors (1260380382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1242123042 is a wasteful number, since it uses less digits than its factorization.

1242123042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2474.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1242123042 is about 35243.7660019471. The cubic root of 1242123042 is about 1074.9498565398.

Adding to 1242123042 its reverse (2403212421), we get a palindrome (3645335463).

The spelling of 1242123042 in words is "one billion, two hundred forty-two million, one hundred twenty-three thousand, forty-two".