18109965 has 8 divisors (see below), whose sum is σ = 28975968. Its totient is φ = 9658640.

The previous prime is 18109963. The next prime is 18109969. The reversal of 18109965 is 56990181.

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

It is not a de Polignac number, because 18109965 - 2¹ = 18109963 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18109961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 603651 + ... + 603680.

It is an arithmetic number, because the mean of its divisors is an integer number (3621996).

Almost surely, 2^18109965 is an apocalyptic number.

18109965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18109965 is a deficient number, since it is larger than the sum of its proper divisors (10866003).

18109965 is a wasteful number, since it uses less digits than its factorization.

18109965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1207339.

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 18109965 is about 4255.5804539451. The cubic root of 18109965 is about 262.6067411701.

The spelling of 18109965 in words is "eighteen million, one hundred nine thousand, nine hundred sixty-five".