120209999 has 16 divisors (see below), whose sum is σ = 148223040. Its totient is φ = 94936320.

The previous prime is 120209987. The next prime is 120210001. The reversal of 120209999 is 999902021.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120209999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120209939) 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 15 ways as a sum of consecutive naturals, for example, 73907 + ... + 75515.

It is an arithmetic number, because the mean of its divisors is an integer number (9263940).

Almost surely, 2^120209999 is an apocalyptic number.

120209999 is a deficient number, since it is larger than the sum of its proper divisors (28013041).

120209999 is a wasteful number, since it uses less digits than its factorization.

120209999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2450.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 120209999 is about 10964.0320594205. The cubic root of 120209999 is about 493.5299705631.

The spelling of 120209999 in words is "one hundred twenty million, two hundred nine thousand, nine hundred ninety-nine".