109809985 has 16 divisors (see below), whose sum is σ = 134551872. Its totient is φ = 86011200.

The previous prime is 109809977. The next prime is 109809989. The reversal of 109809985 is 589908901.

It is a happy number.

It is not a de Polignac number, because 109809985 - 2³ = 109809977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109809989) 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 15 ways as a sum of consecutive naturals, for example, 59730 + ... + 61540.

It is an arithmetic number, because the mean of its divisors is an integer number (8409492).

Almost surely, 2^109809985 is an apocalyptic number.

It is an amenable number.

109809985 is a deficient number, since it is larger than the sum of its proper divisors (24741887).

109809985 is a wasteful number, since it uses less digits than its factorization.

109809985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2064.

The product of its (nonzero) digits is 233280, while the sum is 49.

The square root of 109809985 is about 10479.0259566431. The cubic root of 109809985 is about 478.8659352872.

The spelling of 109809985 in words is "one hundred nine million, eight hundred nine thousand, nine hundred eighty-five".