121864188 has 24 divisors (see below), whose sum is σ = 285546240. Its totient is φ = 40450480.

The previous prime is 121864181. The next prime is 121864201. The reversal of 121864188 is 881468121.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121864181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18378 + ... + 24113.

It is an arithmetic number, because the mean of its divisors is an integer number (11897760).

Almost surely, 2^121864188 is an apocalyptic number.

It is an amenable number.

121864188 is an abundant number, since it is smaller than the sum of its proper divisors (163682052).

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

121864188 is a wasteful number, since it uses less digits than its factorization.

121864188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42737 (or 42735 counting only the distinct ones).

The product of its digits is 24576, while the sum is 39.

The square root of 121864188 is about 11039.2113848771. The cubic root of 121864188 is about 495.7834588505.

The spelling of 121864188 in words is "one hundred twenty-one million, eight hundred sixty-four thousand, one hundred eighty-eight".