122198128 has 40 divisors (see below), whose sum is σ = 259177856. Its totient is φ = 55468800.

The previous prime is 122198123. The next prime is 122198129. The reversal of 122198128 is 821891221.

It is a junction number, because it is equal to n+sod(n) for n = 122198093 and 122198102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122198123) 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, 7873 + ... + 17503.

Almost surely, 2^122198128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 122198128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129588928).

122198128 is an abundant number, since it is smaller than the sum of its proper divisors (136979728).

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

122198128 is a wasteful number, since it uses less digits than its factorization.

122198128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9713 (or 9707 counting only the distinct ones).

The product of its digits is 4608, while the sum is 34.

The square root of 122198128 is about 11054.3262119407. The cubic root of 122198128 is about 496.2359049519.

The spelling of 122198128 in words is "one hundred twenty-two million, one hundred ninety-eight thousand, one hundred twenty-eight".