121985826 has 8 divisors (see below), whose sum is σ = 243971664. Its totient is φ = 40661940.

The previous prime is 121985771. The next prime is 121985827. The reversal of 121985826 is 628589121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

121985826 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121985827) 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 3 ways as a sum of consecutive naturals, for example, 10165480 + ... + 10165491.

It is an arithmetic number, because the mean of its divisors is an integer number (30496458).

Almost surely, 2^121985826 is an apocalyptic number.

121985826 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

121985826 is a wasteful number, since it uses less digits than its factorization.

121985826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20330976.

The product of its digits is 69120, while the sum is 42.

The square root of 121985826 is about 11044.7193717179. The cubic root of 121985826 is about 495.9483584155.

The spelling of 121985826 in words is "one hundred twenty-one million, nine hundred eighty-five thousand, eight hundred twenty-six".