121789388 has 12 divisors (see below), whose sum is σ = 243578832. Its totient is φ = 52195440.

The previous prime is 121789387. The next prime is 121789399. The reversal of 121789388 is 883987121.

121789388 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (121789387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2174783 + ... + 2174838.

It is an arithmetic number, because the mean of its divisors is an integer number (20298236).

Almost surely, 2^121789388 is an apocalyptic number.

It is an amenable number.

121789388 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

121789388 is a wasteful number, since it uses less digits than its factorization.

121789388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4349632 (or 4349630 counting only the distinct ones).

The product of its digits is 193536, while the sum is 47.

The square root of 121789388 is about 11035.8229416750. The cubic root of 121789388 is about 495.6820011174.

The spelling of 121789388 in words is "one hundred twenty-one million, seven hundred eighty-nine thousand, three hundred eighty-eight".