128731242 has 16 divisors (see below), whose sum is σ = 272607552. Its totient is φ = 40386240.

The previous prime is 128731241. The next prime is 128731249. The reversal of 128731242 is 242137821.

It is not an unprimeable number, because it can be changed into a prime (128731241) 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 7 ways as a sum of consecutive naturals, for example, 630934 + ... + 631137.

It is an arithmetic number, because the mean of its divisors is an integer number (17037972).

Almost surely, 2^128731242 is an apocalyptic number.

128731242 is an abundant number, since it is smaller than the sum of its proper divisors (143876310).

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

128731242 is a wasteful number, since it uses less digits than its factorization.

128731242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262093.

The product of its digits is 5376, while the sum is 30.

The square root of 128731242 is about 11345.9791115619. The cubic root of 128731242 is about 504.9262931998.

The spelling of 128731242 in words is "one hundred twenty-eight million, seven hundred thirty-one thousand, two hundred forty-two".