121775388 has 72 divisors (see below), whose sum is σ = 335179152. Its totient is φ = 34304256.

The previous prime is 121775377. The next prime is 121775393. The reversal of 121775388 is 883577121.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

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 (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41506 + ... + 44342.

It is an arithmetic number, because the mean of its divisors is an integer number (4655266).

Almost surely, 2^121775388 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 121775388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167589576).

121775388 is an abundant number, since it is smaller than the sum of its proper divisors (213403764).

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

121775388 is a wasteful number, since it uses less digits than its factorization.

121775388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2931 (or 2922 counting only the distinct ones).

The product of its digits is 94080, while the sum is 42.

The square root of 121775388 is about 11035.1886254835. The cubic root of 121775388 is about 495.6630070872.

The spelling of 121775388 in words is "one hundred twenty-one million, seven hundred seventy-five thousand, three hundred eighty-eight".