121785804 has 72 divisors (see below), whose sum is σ = 360039680. Its totient is φ = 33983712.

The previous prime is 121785799. The next prime is 121785821. The reversal of 121785804 is 408587121.

121785804 is a `hidden beast` number, since 1 + 2 + 1 + 78 + 580 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 23 ways as a sum of consecutive naturals, for example, 5217 + ... + 16455.

Almost surely, 2^121785804 is an apocalyptic number.

121785804 is a gapful number since it is divisible by the number (14) 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 121785804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180019840).

121785804 is an abundant number, since it is smaller than the sum of its proper divisors (238253876).

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

121785804 is a wasteful number, since it uses less digits than its factorization.

121785804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11299 (or 11294 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 36.

The square root of 121785804 is about 11035.6605602021. The cubic root of 121785804 is about 495.6771387843.

The spelling of 121785804 in words is "one hundred twenty-one million, seven hundred eighty-five thousand, eight hundred four".