121705280 has 28 divisors (see below), whose sum is σ = 289811460. Its totient is φ = 48681984.

The previous prime is 121705273. The next prime is 121705291. The reversal of 121705280 is 82507121.

It can be written as a sum of positive squares in 2 ways, for example, as 43983424 + 77721856 = 6632^2 + 8816^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189845 + ... + 190484.

Almost surely, 2^121705280 is an apocalyptic number.

121705280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121705280 is an abundant number, since it is smaller than the sum of its proper divisors (168106180).

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

121705280 is an equidigital number, since it uses as much as digits as its factorization.

121705280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380346 (or 380336 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 121705280 is about 11032.0116026045. The cubic root of 121705280 is about 495.5678685060.

The spelling of 121705280 in words is "one hundred twenty-one million, seven hundred five thousand, two hundred eighty".