121805880 has 64 divisors (see below), whose sum is σ = 417623040. Its totient is φ = 27841152.

The previous prime is 121805791. The next prime is 121805891. The reversal of 121805880 is 88508121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71664 + ... + 73343.

It is an arithmetic number, because the mean of its divisors is an integer number (6525360).

Almost surely, 2^121805880 is an apocalyptic number.

121805880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121805880 is an abundant number, since it is smaller than the sum of its proper divisors (295817160).

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

121805880 is a wasteful number, since it uses less digits than its factorization.

121805880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145028 (or 145024 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 33.

The square root of 121805880 is about 11036.5701193804. The cubic root of 121805880 is about 495.7043742178.

The spelling of 121805880 in words is "one hundred twenty-one million, eight hundred five thousand, eight hundred eighty".