121780854 has 64 divisors (see below), whose sum is σ = 297722880. Its totient is φ = 36663840.

The previous prime is 121780811. The next prime is 121780871. The reversal of 121780854 is 458087121.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31149 + ... + 34839.

It is an arithmetic number, because the mean of its divisors is an integer number (4651920).

Almost surely, 2^121780854 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121780854, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148861440).

121780854 is an abundant number, since it is smaller than the sum of its proper divisors (175942026).

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

121780854 is a wasteful number, since it uses less digits than its factorization.

121780854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3762 (or 3756 counting only the distinct ones).

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

The square root of 121780854 is about 11035.4362849867. The cubic root of 121780854 is about 495.6704230725.

The spelling of 121780854 in words is "one hundred twenty-one million, seven hundred eighty thousand, eight hundred fifty-four".