121908930 has 128 divisors (see below), whose sum is σ = 347832576. Its totient is φ = 26956800.

The previous prime is 121908911. The next prime is 121908931. The reversal of 121908930 is 39809121.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 121908891 and 121908900.

It is not an unprimeable number, because it can be changed into a prime (121908931) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 673440 + ... + 673620.

It is an arithmetic number, because the mean of its divisors is an integer number (2717442).

Almost surely, 2^121908930 is an apocalyptic number.

121908930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121908930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173916288).

121908930 is an abundant number, since it is smaller than the sum of its proper divisors (225923646).

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

121908930 is a wasteful number, since it uses less digits than its factorization.

121908930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 121908930 is about 11041.2377023593. The cubic root of 121908930 is about 495.8441264667.

The spelling of 121908930 in words is "one hundred twenty-one million, nine hundred eight thousand, nine hundred thirty".