642039123 has 16 divisors (see below), whose sum is σ = 943126272. Its totient is φ = 385260000.

The previous prime is 642039071. The next prime is 642039137. The reversal of 642039123 is 321930246.

642039123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 642039123 - 2⁸ = 642038867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642039163) 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, 92983 + ... + 99648.

It is an arithmetic number, because the mean of its divisors is an integer number (58945392).

Almost surely, 2^642039123 is an apocalyptic number.

642039123 is a deficient number, since it is larger than the sum of its proper divisors (301087149).

642039123 is a wasteful number, since it uses less digits than its factorization.

642039123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192746.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 642039123 is about 25338.4909377019. The cubic root of 642039123 is about 862.6881468141.

Adding to 642039123 its reverse (321930246), we get a palindrome (963969369).

The spelling of 642039123 in words is "six hundred forty-two million, thirty-nine thousand, one hundred twenty-three".