142440123 has 32 divisors (see below), whose sum is σ = 223382016. Its totient is φ = 79043328.

The previous prime is 142440119. The next prime is 142440143. The reversal of 142440123 is 321044241.

It is not a de Polignac number, because 142440123 - 2² = 142440119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 142440123.

It is not an unprimeable number, because it can be changed into a prime (142440143) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 210061 + ... + 210737.

It is an arithmetic number, because the mean of its divisors is an integer number (6980688).

Almost surely, 2^142440123 is an apocalyptic number.

142440123 is a deficient number, since it is larger than the sum of its proper divisors (80941893).

142440123 is a wasteful number, since it uses less digits than its factorization.

142440123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963.

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

The square root of 142440123 is about 11934.8281512555. The cubic root of 142440123 is about 522.2487950984.

Adding to 142440123 its reverse (321044241), we get a palindrome (463484364).

The spelling of 142440123 in words is "one hundred forty-two million, four hundred forty thousand, one hundred twenty-three".