121838388 has 96 divisors (see below), whose sum is σ = 352574208. Its totient is φ = 31948800.

The previous prime is 121838377. The next prime is 121838399. The reversal of 121838388 is 883838121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (121838377) and next prime (121838399).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 57508 + ... + 59588.

It is an arithmetic number, because the mean of its divisors is an integer number (3672648).

Almost surely, 2^121838388 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121838388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176287104).

121838388 is an abundant number, since it is smaller than the sum of its proper divisors (230735820).

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

121838388 is a wasteful number, since it uses less digits than its factorization.

121838388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2153 (or 2151 counting only the distinct ones).

The product of its digits is 73728, while the sum is 42.

The square root of 121838388 is about 11038.0427612870. The cubic root of 121838388 is about 495.7484687624.

The spelling of 121838388 in words is "one hundred twenty-one million, eight hundred thirty-eight thousand, three hundred eighty-eight".