18618019 has 4 divisors (see below), whose sum is σ = 21277744. Its totient is φ = 15958296.

The previous prime is 18617987. The next prime is 18618049. The reversal of 18618019 is 91081681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91081681 = 307 ⋅296683.

It is a cyclic number.

It is not a de Polignac number, because 18618019 - 2⁵ = 18617987 is a prime.

It is a super-2 number, since 2×18618019² = 693261262968722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18618049) 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 3 ways as a sum of consecutive naturals, for example, 1329852 + ... + 1329865.

It is an arithmetic number, because the mean of its divisors is an integer number (5319436).

Almost surely, 2^18618019 is an apocalyptic number.

18618019 is a deficient number, since it is larger than the sum of its proper divisors (2659725).

18618019 is an equidigital number, since it uses as much as digits as its factorization.

18618019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2659724.

The product of its (nonzero) digits is 3456, while the sum is 34.

The square root of 18618019 is about 4314.8602526617. The cubic root of 18618019 is about 265.0398373716.

The spelling of 18618019 in words is "eighteen million, six hundred eighteen thousand, nineteen".