121784238 has 24 divisors (see below), whose sum is σ = 269481888. Its totient is φ = 39730752.

The previous prime is 121784233. The next prime is 121784251. The reversal of 121784238 is 832487121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121784233) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71131 + ... + 72822.

It is an arithmetic number, because the mean of its divisors is an integer number (11228412).

Almost surely, 2^121784238 is an apocalyptic number.

121784238 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

121784238 is an abundant number, since it is smaller than the sum of its proper divisors (147697650).

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

121784238 is a wasteful number, since it uses less digits than its factorization.

121784238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144008 (or 144005 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 121784238 is about 11035.5896081723. The cubic root of 121784238 is about 495.6750141970.

The spelling of 121784238 in words is "one hundred twenty-one million, seven hundred eighty-four thousand, two hundred thirty-eight".