121730240 has 56 divisors (see below), whose sum is σ = 291492432. Its totient is φ = 48419840.

The previous prime is 121730209. The next prime is 121730243. The reversal of 121730240 is 42037121.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (121730243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62075 + ... + 64005.

It is an arithmetic number, because the mean of its divisors is an integer number (5205222).

Almost surely, 2^121730240 is an apocalyptic number.

121730240 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 121730240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145746216).

121730240 is an abundant number, since it is smaller than the sum of its proper divisors (169762192).

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

121730240 is a wasteful number, since it uses less digits than its factorization.

121730240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2145 (or 2135 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 121730240 is about 11033.1427979520. The cubic root of 121730240 is about 495.6017441343.

Adding to 121730240 its reverse (42037121), we get a palindrome (163767361).

The spelling of 121730240 in words is "one hundred twenty-one million, seven hundred thirty thousand, two hundred forty".