18213427 has 4 divisors (see below), whose sum is σ = 18463000. Its totient is φ = 17963856.

The previous prime is 18213383. The next prime is 18213449. The reversal of 18213427 is 72431281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72431281 = 13 ⋅5571637.

It is a cyclic number.

It is not a de Polignac number, because 18213427 - 2²³ = 9824819 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18213395 and 18213404.

It is not an unprimeable number, because it can be changed into a prime (18213497) 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, 124677 + ... + 124822.

It is an arithmetic number, because the mean of its divisors is an integer number (4615750).

Almost surely, 2^18213427 is an apocalyptic number.

18213427 is a deficient number, since it is larger than the sum of its proper divisors (249573).

18213427 is an equidigital number, since it uses as much as digits as its factorization.

18213427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249572.

The product of its digits is 2688, while the sum is 28.

The square root of 18213427 is about 4267.7191800773. The cubic root of 18213427 is about 263.1058815048.

The spelling of 18213427 in words is "eighteen million, two hundred thirteen thousand, four hundred twenty-seven".