121800456 has 64 divisors (see below), whose sum is σ = 353059200. Its totient is φ = 38833344.

The previous prime is 121800451. The next prime is 121800521. The reversal of 121800456 is 654008121.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (121800451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7291 + ... + 17226.

It is an arithmetic number, because the mean of its divisors is an integer number (5516550).

Almost surely, 2^121800456 is an apocalyptic number.

It is an amenable number.

121800456 is an abundant number, since it is smaller than the sum of its proper divisors (231258744).

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

121800456 is a wasteful number, since it uses less digits than its factorization.

121800456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24555 (or 24545 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 121800456 is about 11036.3243881285. The cubic root of 121800456 is about 495.6970162248.

Adding to 121800456 its reverse (654008121), we get a palindrome (775808577).

The spelling of 121800456 in words is "one hundred twenty-one million, eight hundred thousand, four hundred fifty-six".