121947804 has 72 divisors (see below), whose sum is σ = 339721200. Its totient is φ = 36576000.

The previous prime is 121947803. The next prime is 121947809. The reversal of 121947804 is 408749121.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121947803) by changing a digit.

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, 38472 + ... + 41520.

It is an arithmetic number, because the mean of its divisors is an integer number (4718350).

Almost surely, 2^121947804 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 121947804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169860600).

121947804 is an abundant number, since it is smaller than the sum of its proper divisors (217773396).

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

121947804 is a wasteful number, since it uses less digits than its factorization.

121947804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3171 (or 3166 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 121947804 is about 11042.9979625100. The cubic root of 121947804 is about 495.8968253573.

The spelling of 121947804 in words is "one hundred twenty-one million, nine hundred forty-seven thousand, eight hundred four".