121438992 has 80 divisors (see below), whose sum is σ = 322390080. Its totient is φ = 39376896.

The previous prime is 121438963. The next prime is 121439047. The reversal of 121438992 is 299834121.

It is a self number, because there is not a number n which added to its sum of digits gives 121438992.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 387828 + ... + 388140.

It is an arithmetic number, because the mean of its divisors is an integer number (4029876).

Almost surely, 2^121438992 is an apocalyptic number.

121438992 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 121438992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161195040).

121438992 is an abundant number, since it is smaller than the sum of its proper divisors (200951088).

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

121438992 is a wasteful number, since it uses less digits than its factorization.

121438992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520 (or 514 counting only the distinct ones).

The product of its digits is 31104, while the sum is 39.

The square root of 121438992 is about 11019.9361159673. The cubic root of 121438992 is about 495.2061746990.

The spelling of 121438992 in words is "one hundred twenty-one million, four hundred thirty-eight thousand, nine hundred ninety-two".