121857280 has 144 divisors (see below), whose sum is σ = 313173504. Its totient is φ = 45342720.

The previous prime is 121857259. The next prime is 121857299. The reversal of 121857280 is 82758121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1468119 + ... + 1468201.

It is an arithmetic number, because the mean of its divisors is an integer number (2174816).

Almost surely, 2^121857280 is an apocalyptic number.

121857280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121857280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156586752).

121857280 is an abundant number, since it is smaller than the sum of its proper divisors (191316224).

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

121857280 is an equidigital number, since it uses as much as digits as its factorization.

121857280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 34.

The square root of 121857280 is about 11038.8984957739. The cubic root of 121857280 is about 495.7740906708.

The spelling of 121857280 in words is "one hundred twenty-one million, eight hundred fifty-seven thousand, two hundred eighty".