120309999 has 8 divisors (see below), whose sum is σ = 160772400. Its totient is φ = 80027136.

The previous prime is 120309991. The next prime is 120310013. The reversal of 120309999 is 999903021.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 120309999 - 2³ = 120309991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 120309999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120309991) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 43312 + ... + 46005.

It is an arithmetic number, because the mean of its divisors is an integer number (20096550).

Almost surely, 2^120309999 is an apocalyptic number.

120309999 is a deficient number, since it is larger than the sum of its proper divisors (40462401).

120309999 is an equidigital number, since it uses as much as digits as its factorization.

120309999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89769.

The product of its (nonzero) digits is 39366, while the sum is 42.

The square root of 120309999 is about 10968.5914774870. The cubic root of 120309999 is about 493.6667848009. Note that the first 3 decimals are identical.

The spelling of 120309999 in words is "one hundred twenty million, three hundred nine thousand, nine hundred ninety-nine".