121786128 has 60 divisors (see below), whose sum is σ = 341750448. Its totient is φ = 40486080.

The previous prime is 121786123. The next prime is 121786139. The reversal of 121786128 is 821687121.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 121786092 and 121786101.

It is not an unprimeable number, because it can be changed into a prime (121786123) 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 11 ways as a sum of consecutive naturals, for example, 66343 + ... + 68153.

Almost surely, 2^121786128 is an apocalyptic number.

121786128 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

121786128 is an abundant number, since it is smaller than the sum of its proper divisors (219964320).

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

121786128 is a wasteful number, since it uses less digits than its factorization.

121786128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2292 (or 2283 counting only the distinct ones).

The product of its digits is 10752, while the sum is 36.

The square root of 121786128 is about 11035.6752398754. The cubic root of 121786128 is about 495.6775783518.

The spelling of 121786128 in words is "one hundred twenty-one million, seven hundred eighty-six thousand, one hundred twenty-eight".