18613189 has 12 divisors (see below), whose sum is σ = 21872268. Its totient is φ = 15792000.

The previous prime is 18613169. The next prime is 18613201. The reversal of 18613189 is 98131681.

It can be written as a sum of positive squares in 2 ways, for example, as 14025025 + 4588164 = 3745^2 + 2142^2 .

It is not a de Polignac number, because 18613189 - 2⁷ = 18613061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18613129) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3069 + ... + 6829.

It is an arithmetic number, because the mean of its divisors is an integer number (1822689).

Almost surely, 2^18613189 is an apocalyptic number.

It is an amenable number.

18613189 is a deficient number, since it is larger than the sum of its proper divisors (3259079).

18613189 is a wasteful number, since it uses less digits than its factorization.

18613189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3876 (or 3869 counting only the distinct ones).

The product of its digits is 10368, while the sum is 37.

The square root of 18613189 is about 4314.3005226804. The cubic root of 18613189 is about 265.0169159725.

It can be divided in two parts, 1861 and 3189, that added together give a triangular number (5050 = T₁₀₀).

The spelling of 18613189 in words is "eighteen million, six hundred thirteen thousand, one hundred eighty-nine".