18130819 has 4 divisors (see below), whose sum is σ = 20720944. Its totient is φ = 15540696.

The previous prime is 18130817. The next prime is 18130867. The reversal of 18130819 is 91803181.

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

It is a cyclic number.

It is not a de Polignac number, because 18130819 - 2¹ = 18130817 is a prime.

It is a super-2 number, since 2×18130819² = 657453195221522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18130811) 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, 1295052 + ... + 1295065.

It is an arithmetic number, because the mean of its divisors is an integer number (5180236).

Almost surely, 2^18130819 is an apocalyptic number.

18130819 is a deficient number, since it is larger than the sum of its proper divisors (2590125).

18130819 is an equidigital number, since it uses as much as digits as its factorization.

18130819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2590124.

The product of its (nonzero) digits is 1728, while the sum is 31.

The square root of 18130819 is about 4258.0299435302. The cubic root of 18130819 is about 262.7075015390.

The spelling of 18130819 in words is "eighteen million, one hundred thirty thousand, eight hundred nineteen".