121780908 has 48 divisors (see below), whose sum is σ = 319649120. Its totient is φ = 40590720.

The previous prime is 121780871. The next prime is 121780913. The reversal of 121780908 is 809087121.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1788 + ... + 15708.

Almost surely, 2^121780908 is an apocalyptic number.

121780908 is a gapful number since it is divisible by the number (18) 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 121780908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159824560).

121780908 is an abundant number, since it is smaller than the sum of its proper divisors (197868212).

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

121780908 is an equidigital number, since it uses as much as digits as its factorization.

121780908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13946 (or 13926 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 121780908 is about 11035.4387316500. The cubic root of 121780908 is about 495.6704963358.

The spelling of 121780908 in words is "one hundred twenty-one million, seven hundred eighty thousand, nine hundred eight".