121685740 has 48 divisors (see below), whose sum is σ = 288398880. Its totient is φ = 42721280.

The previous prime is 121685737. The next prime is 121685741. The reversal of 121685740 is 47586121.

It is a junction number, because it is equal to n+sod(n) for n = 121685696 and 121685705.

It is not an unprimeable number, because it can be changed into a prime (121685741) by changing a digit.

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, 3157 + ... + 15916.

It is an arithmetic number, because the mean of its divisors is an integer number (6008310).

Almost surely, 2^121685740 is an apocalyptic number.

121685740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121685740 is an abundant number, since it is smaller than the sum of its proper divisors (166713140).

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

121685740 is a wasteful number, since it uses less digits than its factorization.

121685740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19122 (or 19120 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 121685740 is about 11031.1259624755. The cubic root of 121685740 is about 495.5413456511.

The spelling of 121685740 in words is "one hundred twenty-one million, six hundred eighty-five thousand, seven hundred forty".