121987944 has 112 divisors (see below), whose sum is σ = 369543300. Its totient is φ = 37511424.

The previous prime is 121987933. The next prime is 121987967. The reversal of 121987944 is 449789121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 120165444 + 1822500 = 10962^2 + 1350^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 121987944.

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 27 ways as a sum of consecutive naturals, for example, 75012 + ... + 76620.

Almost surely, 2^121987944 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 121987944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184771650).

121987944 is an abundant number, since it is smaller than the sum of its proper divisors (247555356).

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

121987944 is a wasteful number, since it uses less digits than its factorization.

121987944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646 (or 1627 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 121987944 is about 11044.8152542268. The cubic root of 121987944 is about 495.9512287286.

The spelling of 121987944 in words is "one hundred twenty-one million, nine hundred eighty-seven thousand, nine hundred forty-four".