18418539 has 4 divisors (see below), whose sum is σ = 24558056. Its totient is φ = 12279024.

The previous prime is 18418537. The next prime is 18418549. The reversal of 18418539 is 93581481.

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

It is not a de Polignac number, because 18418539 - 2¹ = 18418537 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18418497 and 18418506.

It is not an unprimeable number, because it can be changed into a prime (18418537) 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, 3069754 + ... + 3069759.

It is an arithmetic number, because the mean of its divisors is an integer number (6139514).

Almost surely, 2^18418539 is an apocalyptic number.

18418539 is a deficient number, since it is larger than the sum of its proper divisors (6139517).

18418539 is an equidigital number, since it uses as much as digits as its factorization.

18418539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6139516.

The product of its digits is 34560, while the sum is 39.

The square root of 18418539 is about 4291.6825371875. The cubic root of 18418539 is about 264.0898597913.

The spelling of 18418539 in words is "eighteen million, four hundred eighteen thousand, five hundred thirty-nine".