18423005 has 4 divisors (see below), whose sum is σ = 22107612. Its totient is φ = 14738400.

The previous prime is 18422983. The next prime is 18423007. The reversal of 18423005 is 50032481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50032481 = 31 ⋅1613951.

It can be written as a sum of positive squares in 2 ways, for example, as 12376324 + 6046681 = 3518^2 + 2459^2 .

It is not a de Polignac number, because 18423005 - 2⁶ = 18422941 is a prime.

It is a super-2 number, since 2×18423005² = 678814226460050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18423007) 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 3 ways as a sum of consecutive naturals, for example, 1842296 + ... + 1842305.

It is an arithmetic number, because the mean of its divisors is an integer number (5526903).

Almost surely, 2^18423005 is an apocalyptic number.

It is an amenable number.

18423005 is a deficient number, since it is larger than the sum of its proper divisors (3684607).

18423005 is an equidigital number, since it uses as much as digits as its factorization.

18423005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3684606.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 18423005 is about 4292.2028144066. The cubic root of 18423005 is about 264.1112029608. Note that the first 3 decimals are identical.

Adding to 18423005 its reverse (50032481), we get a palindrome (68455486).

The spelling of 18423005 in words is "eighteen million, four hundred twenty-three thousand, five".