18243039 has 4 divisors (see below), whose sum is σ = 24324056. Its totient is φ = 12162024.

The previous prime is 18243037. The next prime is 18243041. The reversal of 18243039 is 93034281.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (18243037) and next prime (18243041).

It is not a de Polignac number, because 18243039 - 2¹ = 18243037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18242997 and 18243015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18243037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3040504 + ... + 3040509.

It is an arithmetic number, because the mean of its divisors is an integer number (6081014).

Almost surely, 2^18243039 is an apocalyptic number.

18243039 is a deficient number, since it is larger than the sum of its proper divisors (6081017).

18243039 is an equidigital number, since it uses as much as digits as its factorization.

18243039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6081016.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 18243039 is about 4271.1870715294. The cubic root of 18243039 is about 263.2483930858.

The spelling of 18243039 in words is "eighteen million, two hundred forty-three thousand, thirty-nine".