120899999 has 4 divisors (see below), whose sum is σ = 131890920. Its totient is φ = 109909080.

The previous prime is 120899993. The next prime is 120900023. The reversal of 120899999 is 999998021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 120899999 - 2¹² = 120895903 is a prime.

It is a Duffinian number.

120899999 is a modest number, since divided by 99999 gives 1208 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120899993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5495444 + ... + 5495465.

It is an arithmetic number, because the mean of its divisors is an integer number (32972730).

Almost surely, 2^120899999 is an apocalyptic number.

120899999 is a deficient number, since it is larger than the sum of its proper divisors (10990921).

120899999 is a wasteful number, since it uses less digits than its factorization.

120899999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10990920.

The product of its (nonzero) digits is 944784, while the sum is 56.

The square root of 120899999 is about 10995.4535604494. The cubic root of 120899999 is about 494.4724495558.

The spelling of 120899999 in words is "one hundred twenty million, eight hundred ninety-nine thousand, nine hundred ninety-nine".