120389665 has 32 divisors (see below), whose sum is σ = 167806080. Its totient is φ = 81945600.

The previous prime is 120389663. The next prime is 120389669. The reversal of 120389665 is 566983021.

It is not a de Polignac number, because 120389665 - 2¹ = 120389663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (120389663) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 309291 + ... + 309679.

It is an arithmetic number, because the mean of its divisors is an integer number (5243940).

Almost surely, 2^120389665 is an apocalyptic number.

It is an amenable number.

120389665 is a deficient number, since it is larger than the sum of its proper divisors (47416415).

120389665 is a wasteful number, since it uses less digits than its factorization.

120389665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 120389665 is about 10972.2224275668. Note that the first 3 decimals coincide. The cubic root of 120389665 is about 493.7757249856.

The spelling of 120389665 in words is "one hundred twenty million, three hundred eighty-nine thousand, six hundred sixty-five".