142247123 has 4 divisors (see below), whose sum is σ = 142490040. Its totient is φ = 142004208.

The previous prime is 142247101. The next prime is 142247153. The reversal of 142247123 is 321742241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321742241 = 67 ⋅4802123.

It is a cyclic number.

It is not a de Polignac number, because 142247123 - 2²² = 138052819 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 142247092 and 142247101.

It is not an unprimeable number, because it can be changed into a prime (142247153) 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, 120578 + ... + 121751.

It is an arithmetic number, because the mean of its divisors is an integer number (35622510).

Almost surely, 2^142247123 is an apocalyptic number.

142247123 is a deficient number, since it is larger than the sum of its proper divisors (242917).

142247123 is an equidigital number, since it uses as much as digits as its factorization.

142247123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242916.

The product of its digits is 2688, while the sum is 26.

The square root of 142247123 is about 11926.7398311525. The cubic root of 142247123 is about 522.0128138935.

Adding to 142247123 its reverse (321742241), we get a palindrome (463989364).

The spelling of 142247123 in words is "one hundred forty-two million, two hundred forty-seven thousand, one hundred twenty-three".