121979800 has 48 divisors (see below), whose sum is σ = 293396400. Its totient is φ = 47107200.

The previous prime is 121979783. The next prime is 121979807. The reversal of 121979800 is 8979121.

It is a self number, because there is not a number n which added to its sum of digits gives 121979800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121979807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4716 + ... + 16315.

It is an arithmetic number, because the mean of its divisors is an integer number (6112425).

Almost surely, 2^121979800 is an apocalyptic number.

121979800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121979800 is an abundant number, since it is smaller than the sum of its proper divisors (171416600).

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

121979800 is a wasteful number, since it uses less digits than its factorization.

121979800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21076 (or 21067 counting only the distinct ones).

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

The square root of 121979800 is about 11044.4465682985. The cubic root of 121979800 is about 495.9401918000.

The spelling of 121979800 in words is "one hundred twenty-one million, nine hundred seventy-nine thousand, eight hundred".