121899984 has 20 divisors (see below), whose sum is σ = 314908416. Its totient is φ = 40633312.

The previous prime is 121899919. The next prime is 121899989. The reversal of 121899984 is 489998121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121899989) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1269744 + ... + 1269839.

Almost surely, 2^121899984 is an apocalyptic number.

It is an amenable number.

121899984 is an abundant number, since it is smaller than the sum of its proper divisors (193008432).

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

121899984 is a wasteful number, since it uses less digits than its factorization.

121899984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2539594 (or 2539588 counting only the distinct ones).

The product of its digits is 373248, while the sum is 51.

The square root of 121899984 is about 11040.8325773014. The cubic root of 121899984 is about 495.8319973852.

The spelling of 121899984 in words is "one hundred twenty-one million, eight hundred ninety-nine thousand, nine hundred eighty-four".