121689888 has 48 divisors (see below), whose sum is σ = 320554080. Its totient is φ = 40421376.

The previous prime is 121689863. The next prime is 121689901. The reversal of 121689888 is 888986121.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 121689888.

It is an unprimeable number.

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, 27408 + ... + 31536.

It is an arithmetic number, because the mean of its divisors is an integer number (6678210).

Almost surely, 2^121689888 is an apocalyptic number.

It is an amenable number.

121689888 is an abundant number, since it is smaller than the sum of its proper divisors (198864192).

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

121689888 is a wasteful number, since it uses less digits than its factorization.

121689888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4449 (or 4441 counting only the distinct ones).

The product of its digits is 442368, while the sum is 51.

The square root of 121689888 is about 11031.3139743187. The cubic root of 121689888 is about 495.5469762264.

The spelling of 121689888 in words is "one hundred twenty-one million, six hundred eighty-nine thousand, eight hundred eighty-eight".