121686480 has 60 divisors (see below), whose sum is σ = 408666180. Its totient is φ = 32449536.

The previous prime is 121686479. The next prime is 121686503. The reversal of 121686480 is 84686121.

121686480 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 8 + 648 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 46621584 + 75064896 = 6828^2 + 8664^2 .

It is a tau number, because it is divible by the number of its divisors (60).

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

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 83785 + ... + 85224.

It is an arithmetic number, because the mean of its divisors is an integer number (6811103).

Almost surely, 2^121686480 is an apocalyptic number.

121686480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121686480 is an abundant number, since it is smaller than the sum of its proper divisors (286979700).

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

121686480 is a wasteful number, since it uses less digits than its factorization.

121686480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169028 (or 169019 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 121686480 is about 11031.1595038781. The cubic root of 121686480 is about 495.5423501508.

The spelling of 121686480 in words is "one hundred twenty-one million, six hundred eighty-six thousand, four hundred eighty".