121783580 has 48 divisors (see below), whose sum is σ = 276587136. Its totient is φ = 44866560.

The previous prime is 121783577. The next prime is 121783583. The reversal of 121783580 is 85387121.

It is an interprime number because it is at equal distance from previous prime (121783577) and next prime (121783583).

It is a self number, because there is not a number n which added to its sum of digits gives 121783580.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121783583) by changing a digit.

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, 12170 + ... + 19790.

It is an arithmetic number, because the mean of its divisors is an integer number (5762232).

Almost surely, 2^121783580 is an apocalyptic number.

121783580 is a gapful number since it is divisible by the number (10) 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 121783580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138293568).

121783580 is an abundant number, since it is smaller than the sum of its proper divisors (154803556).

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

121783580 is a wasteful number, since it uses less digits than its factorization.

121783580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7694 (or 7692 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 121783580 is about 11035.5597954975. The cubic root of 121783580 is about 495.6741214850.

The spelling of 121783580 in words is "one hundred twenty-one million, seven hundred eighty-three thousand, five hundred eighty".