121997800 has 24 divisors (see below), whose sum is σ = 283645350. Its totient is φ = 48799040.

The previous prime is 121997783. The next prime is 121997807. The reversal of 121997800 is 8799121.

It can be written as a sum of positive squares in 3 ways, for example, as 67798756 + 54199044 = 8234^2 + 7362^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 121997800.

It is not an unprimeable number, because it can be changed into a prime (121997807) 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 5 ways as a sum of consecutive naturals, for example, 304795 + ... + 305194.

Almost surely, 2^121997800 is an apocalyptic number.

121997800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121997800 is an abundant number, since it is smaller than the sum of its proper divisors (161647550).

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

121997800 is a wasteful number, since it uses less digits than its factorization.

121997800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610005 (or 609996 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 121997800 is about 11045.2614274176. The cubic root of 121997800 is about 495.9645851405.

The spelling of 121997800 in words is "one hundred twenty-one million, nine hundred ninety-seven thousand, eight hundred".