18138427 has 8 divisors (see below), whose sum is σ = 18849600. Its totient is φ = 17433024.

The previous prime is 18138409. The next prime is 18138437. The reversal of 18138427 is 72483181.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 18138427 - 2¹⁹ = 17614139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18138392 and 18138401.

It is not an unprimeable number, because it can be changed into a prime (18138437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5623 + ... + 8239.

It is an arithmetic number, because the mean of its divisors is an integer number (2356200).

Almost surely, 2^18138427 is an apocalyptic number.

18138427 is a deficient number, since it is larger than the sum of its proper divisors (711173).

18138427 is a wasteful number, since it uses less digits than its factorization.

18138427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2885.

The product of its digits is 10752, while the sum is 34.

The square root of 18138427 is about 4258.9232207214. The cubic root of 18138427 is about 262.7442419123.

The spelling of 18138427 in words is "eighteen million, one hundred thirty-eight thousand, four hundred twenty-seven".