18423681 has 8 divisors (see below), whose sum is σ = 24593664. Its totient is φ = 12268080.

The previous prime is 18423679. The next prime is 18423751. The reversal of 18423681 is 18632481.

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

It is not a de Polignac number, because 18423681 - 2¹ = 18423679 is a prime.

It is a super-2 number, since 2×18423681² = 678864043179522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18423611) 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 7 ways as a sum of consecutive naturals, for example, 126 + ... + 6071.

It is an arithmetic number, because the mean of its divisors is an integer number (3074208).

Almost surely, 2^18423681 is an apocalyptic number.

It is an amenable number.

18423681 is a deficient number, since it is larger than the sum of its proper divisors (6169983).

18423681 is an equidigital number, since it uses as much as digits as its factorization.

18423681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7191.

The product of its digits is 9216, while the sum is 33.

The square root of 18423681 is about 4292.2815611281. The cubic root of 18423681 is about 264.1144332878.

The spelling of 18423681 in words is "eighteen million, four hundred twenty-three thousand, six hundred eighty-one".