120999900 has 144 divisors (see below), whose sum is σ = 403751936. Its totient is φ = 27406080.

The previous prime is 120999889. The next prime is 120999947. The reversal of 120999900 is 9999021.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 329517 + ... + 329883.

Almost surely, 2^120999900 is an apocalyptic number.

120999900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 120999900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201875968).

120999900 is an abundant number, since it is smaller than the sum of its proper divisors (282752036).

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

120999900 is a wasteful number, since it uses less digits than its factorization.

120999900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548 (or 541 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 39.

The square root of 120999900 is about 10999.9954545445. The cubic root of 120999900 is about 494.6086080690.

The spelling of 120999900 in words is "one hundred twenty million, nine hundred ninety-nine thousand, nine hundred".