18105419 has 4 divisors (see below), whose sum is σ = 18157944. Its totient is φ = 18052896.

The previous prime is 18105413. The next prime is 18105421. The reversal of 18105419 is 91450181.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18105419 - 2⁴ = 18105403 is a prime.

It is a super-2 number, since 2×18105419² = 655612394331122, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 18105391 and 18105400.

It is not an unprimeable number, because it can be changed into a prime (18105413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25742 + ... + 26435.

It is an arithmetic number, because the mean of its divisors is an integer number (4539486).

Almost surely, 2^18105419 is an apocalyptic number.

18105419 is a deficient number, since it is larger than the sum of its proper divisors (52525).

18105419 is an equidigital number, since it uses as much as digits as its factorization.

18105419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52524.

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 18105419 is about 4255.0462982205. The cubic root of 18105419 is about 262.5847659730.

The spelling of 18105419 in words is "eighteen million, one hundred five thousand, four hundred nineteen".