121728306 has 32 divisors (see below), whose sum is σ = 282803328. Its totient is φ = 34208640.

The previous prime is 121728301. The next prime is 121728323. The reversal of 121728306 is 603827121.

It is not an unprimeable number, because it can be changed into a prime (121728301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21195 + ... + 26318.

It is an arithmetic number, because the mean of its divisors is an integer number (8837604).

Almost surely, 2^121728306 is an apocalyptic number.

121728306 is an abundant number, since it is smaller than the sum of its proper divisors (161075022).

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

121728306 is a wasteful number, since it uses less digits than its factorization.

121728306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47586.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 121728306 is about 11033.0551525858. The cubic root of 121728306 is about 495.5991194815.

The spelling of 121728306 in words is "one hundred twenty-one million, seven hundred twenty-eight thousand, three hundred six".