121685742 has 12 divisors (see below), whose sum is σ = 263652480. Its totient is φ = 40561908.

The previous prime is 121685741. The next prime is 121685777. The reversal of 121685742 is 247586121.

121685742 is a `hidden beast` number, since 1 + 21 + 68 + 574 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 121685697 and 121685706.

It is a congruent number.

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

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3380142 + ... + 3380177.

It is an arithmetic number, because the mean of its divisors is an integer number (21971040).

Almost surely, 2^121685742 is an apocalyptic number.

121685742 is an abundant number, since it is smaller than the sum of its proper divisors (141966738).

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

121685742 is a wasteful number, since it uses less digits than its factorization.

121685742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6760327 (or 6760324 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 121685742 is about 11031.1260531280. The cubic root of 121685742 is about 495.5413483660.

The spelling of 121685742 in words is "one hundred twenty-one million, six hundred eighty-five thousand, seven hundred forty-two".