139128042 has 16 divisors (see below), whose sum is σ = 278721792. Its totient is φ = 46298400.

The previous prime is 139128023. The next prime is 139128043. The reversal of 139128042 is 240821931.

139128042 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×139128042² = 38713224141507528, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (139128043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15459 + ... + 22742.

It is an arithmetic number, because the mean of its divisors is an integer number (17420112).

Almost surely, 2^139128042 is an apocalyptic number.

139128042 is an abundant number, since it is smaller than the sum of its proper divisors (139593750).

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

139128042 is a wasteful number, since it uses less digits than its factorization.

139128042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38813.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 139128042 is about 11795.2550629480. The cubic root of 139128042 is about 518.1691556099.

Adding to 139128042 its reverse (240821931), we get a palindrome (379949973).

The spelling of 139128042 in words is "one hundred thirty-nine million, one hundred twenty-eight thousand, forty-two".