18109427 has 8 divisors (see below), whose sum is σ = 21410400. Its totient is φ = 14986944.

The previous prime is 18109423. The next prime is 18109457. The reversal of 18109427 is 72490181.

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

It is not a de Polignac number, because 18109427 - 2² = 18109423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18109393 and 18109402.

It is not an unprimeable number, because it can be changed into a prime (18109423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44402 + ... + 44807.

It is an arithmetic number, because the mean of its divisors is an integer number (2676300).

Almost surely, 2^18109427 is an apocalyptic number.

18109427 is a deficient number, since it is larger than the sum of its proper divisors (3300973).

18109427 is an equidigital number, since it uses as much as digits as its factorization.

18109427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89245.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 18109427 is about 4255.5172423573. The cubic root of 18109427 is about 262.6041406898.

The spelling of 18109427 in words is "eighteen million, one hundred nine thousand, four hundred twenty-seven".