122500128 has 48 divisors (see below), whose sum is σ = 329416416. Its totient is φ = 39836160.

The previous prime is 122500123. The next prime is 122500129. The reversal of 122500128 is 821005221.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (122500123) 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, 11626 + ... + 19497.

It is an arithmetic number, because the mean of its divisors is an integer number (6862842).

Almost surely, 2^122500128 is an apocalyptic number.

It is an amenable number.

122500128 is an abundant number, since it is smaller than the sum of its proper divisors (206916288).

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

122500128 is a wasteful number, since it uses less digits than its factorization.

122500128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31177 (or 31169 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 122500128 is about 11067.9775930384. The cubic root of 122500128 is about 496.6443671704.

Adding to 122500128 its reverse (821005221), we get a palindrome (943505349).

The spelling of 122500128 in words is "one hundred twenty-two million, five hundred thousand, one hundred twenty-eight".