18109607 has 12 divisors (see below), whose sum is σ = 19392576. Its totient is φ = 16907520.

The previous prime is 18109591. The next prime is 18109633. The reversal of 18109607 is 70690181.

It is not a de Polignac number, because 18109607 - 2⁴ = 18109591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18109667) 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, 64307 + ... + 64587.

It is an arithmetic number, because the mean of its divisors is an integer number (1616048).

Almost surely, 2^18109607 is an apocalyptic number.

18109607 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

18109607 is a deficient number, since it is larger than the sum of its proper divisors (1282969).

18109607 is a wasteful number, since it uses less digits than its factorization.

18109607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538 (or 521 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 18109607 is about 4255.5383913202. The cubic root of 18109607 is about 262.6050107447.

Adding to 18109607 its reverse (70690181), we get a palindrome (88799788).

The spelling of 18109607 in words is "eighteen million, one hundred nine thousand, six hundred seven".