120999969 has 12 divisors (see below), whose sum is σ = 175461156. Its totient is φ = 80351232.

The previous prime is 120999947. The next prime is 120999997. The reversal of 120999969 is 969999021.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 116899344 + 4100625 = 10812^2 + 2025^2 .

It is not a de Polignac number, because 120999969 - 2⁸ = 120999713 is a prime.

It is a super-2 number, since 2×120999969² = 29281984996001922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (120999469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23844 + ... + 28469.

It is an arithmetic number, because the mean of its divisors is an integer number (14621763).

Almost surely, 2^120999969 is an apocalyptic number.

It is an amenable number.

120999969 is a deficient number, since it is larger than the sum of its proper divisors (54461187).

120999969 is a wasteful number, since it uses less digits than its factorization.

120999969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52576 (or 52573 counting only the distinct ones).

The product of its (nonzero) digits is 708588, while the sum is 54.

The square root of 120999969 is about 10999.9985909090. The cubic root of 120999969 is about 494.6087020856.

The spelling of 120999969 in words is "one hundred twenty million, nine hundred ninety-nine thousand, nine hundred sixty-nine".