121889305 has 24 divisors (see below), whose sum is σ = 157177152. Its totient is φ = 90522432.

The previous prime is 121889279. The next prime is 121889309. The reversal of 121889305 is 503988121.

It is not a de Polignac number, because 121889305 - 2²³ = 113500697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121889309) 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 23 ways as a sum of consecutive naturals, for example, 776287 + ... + 776443.

It is an arithmetic number, because the mean of its divisors is an integer number (6549048).

Almost surely, 2^121889305 is an apocalyptic number.

It is an amenable number.

121889305 is a deficient number, since it is larger than the sum of its proper divisors (35287847).

121889305 is an equidigital number, since it uses as much as digits as its factorization.

121889305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385 (or 228 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 121889305 is about 11040.3489528185. The cubic root of 121889305 is about 495.8175179068.

The spelling of 121889305 in words is "one hundred twenty-one million, eight hundred eighty-nine thousand, three hundred five".