121440288 has 48 divisors (see below), whose sum is σ = 322642656. Its totient is φ = 39989760.

The previous prime is 121440281. The next prime is 121440307. The reversal of 121440288 is 882044121.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (121440281) 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, 348 + ... + 15588.

It is an arithmetic number, because the mean of its divisors is an integer number (6721722).

Almost surely, 2^121440288 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121440288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161321328).

121440288 is an abundant number, since it is smaller than the sum of its proper divisors (201202368).

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

121440288 is a wasteful number, since it uses less digits than its factorization.

121440288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15337 (or 15329 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 30.

The square root of 121440288 is about 11019.9949183291. The cubic root of 121440288 is about 495.2079363103.

The spelling of 121440288 in words is "one hundred twenty-one million, four hundred forty thousand, two hundred eighty-eight".