128197442 has 16 divisors (see below), whose sum is σ = 207061920. Its totient is φ = 59304768.

The previous prime is 128197441. The next prime is 128197451. The reversal of 128197442 is 244791821.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 128197396 and 128197405.

It is not an unprimeable number, because it can be changed into a prime (128197441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29948 + ... + 33959.

It is an arithmetic number, because the mean of its divisors is an integer number (12941370).

Almost surely, 2^128197442 is an apocalyptic number.

128197442 is a deficient number, since it is larger than the sum of its proper divisors (78864478).

128197442 is a wasteful number, since it uses less digits than its factorization.

128197442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63985.

The product of its digits is 32256, while the sum is 38.

The square root of 128197442 is about 11322.4309227303. The cubic root of 128197442 is about 504.2274132239.

The spelling of 128197442 in words is "one hundred twenty-eight million, one hundred ninety-seven thousand, four hundred forty-two".