121028789 has 8 divisors (see below), whose sum is σ = 141535680. Its totient is φ = 101326176.

The previous prime is 121028777. The next prime is 121028833. The reversal of 121028789 is 987820121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121028789 - 2⁴ = 121028773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121028189) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200744 + ... + 201345.

It is an arithmetic number, because the mean of its divisors is an integer number (17691960).

Almost surely, 2^121028789 is an apocalyptic number.

It is an amenable number.

121028789 is a deficient number, since it is larger than the sum of its proper divisors (20506891).

121028789 is an equidigital number, since it uses as much as digits as its factorization.

121028789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402139.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 121028789 is about 11001.3085130815. The cubic root of 121028789 is about 494.6479679116.

The spelling of 121028789 in words is "one hundred twenty-one million, twenty-eight thousand, seven hundred eighty-nine".