121765872 has 20 divisors (see below), whose sum is σ = 314561960. Its totient is φ = 40588608.

The previous prime is 121765871. The next prime is 121765901. The reversal of 121765872 is 278567121.

It is a self number, because there is not a number n which added to its sum of digits gives 121765872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121765871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1268347 + ... + 1268442.

It is an arithmetic number, because the mean of its divisors is an integer number (15728098).

Almost surely, 2^121765872 is an apocalyptic number.

121765872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121765872 is an abundant number, since it is smaller than the sum of its proper divisors (192796088).

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

121765872 is a wasteful number, since it uses less digits than its factorization.

121765872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2536800 (or 2536794 counting only the distinct ones).

The product of its digits is 47040, while the sum is 39.

The square root of 121765872 is about 11034.7574508913. The cubic root of 121765872 is about 495.6500957425.

The spelling of 121765872 in words is "one hundred twenty-one million, seven hundred sixty-five thousand, eight hundred seventy-two".