1242343123 has 16 divisors (see below), whose sum is σ = 1430292160. Its totient is φ = 1057038336.

The previous prime is 1242343121. The next prime is 1242343133. The reversal of 1242343123 is 3213432421.

It is a cyclic number.

It is not a de Polignac number, because 1242343123 - 2¹ = 1242343121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242343121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 957211 + ... + 958507.

It is an arithmetic number, because the mean of its divisors is an integer number (89393260).

Almost surely, 2^1242343123 is an apocalyptic number.

1242343123 is a deficient number, since it is larger than the sum of its proper divisors (187949037).

1242343123 is a wasteful number, since it uses less digits than its factorization.

1242343123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2206.

The product of its digits is 3456, while the sum is 25.

The square root of 1242343123 is about 35246.8881321458. Note that the first 3 decimals coincide. The cubic root of 1242343123 is about 1075.0133398020.

Adding to 1242343123 its reverse (3213432421), we get a palindrome (4455775544).

The spelling of 1242343123 in words is "one billion, two hundred forty-two million, three hundred forty-three thousand, one hundred twenty-three".