121839552 has 140 divisors (see below), whose sum is σ = 380486920. Its totient is φ = 38444544.

The previous prime is 121839551. The next prime is 121839569. The reversal of 121839552 is 255938121.

121839552 is a `hidden beast` number, since 1 + 21 + 83 + 9 + 552 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121839551) 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 19 ways as a sum of consecutive naturals, for example, 97878 + ... + 99114.

Almost surely, 2^121839552 is an apocalyptic number.

121839552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121839552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190243460).

121839552 is an abundant number, since it is smaller than the sum of its proper divisors (258647368).

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

121839552 is a wasteful number, since it uses less digits than its factorization.

121839552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280 (or 1261 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 121839552 is about 11038.0954879001. The cubic root of 121839552 is about 495.7500474914.

The spelling of 121839552 in words is "one hundred twenty-one million, eight hundred thirty-nine thousand, five hundred fifty-two".