18418423 has 4 divisors (see below), whose sum is σ = 19219248. Its totient is φ = 17617600.

The previous prime is 18418409. The next prime is 18418427. The reversal of 18418423 is 32481481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32481481 = 269 ⋅120749.

It is a cyclic number.

It is not a de Polignac number, because 18418423 - 2²¹ = 16321271 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 (18418427) 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, 400378 + ... + 400423.

It is an arithmetic number, because the mean of its divisors is an integer number (4804812).

Almost surely, 2^18418423 is an apocalyptic number.

18418423 is a deficient number, since it is larger than the sum of its proper divisors (800825).

18418423 is an equidigital number, since it uses as much as digits as its factorization.

18418423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800824.

The product of its digits is 6144, while the sum is 31.

The square root of 18418423 is about 4291.6690226531. The cubic root of 18418423 is about 264.0893053773.

The spelling of 18418423 in words is "eighteen million, four hundred eighteen thousand, four hundred twenty-three".