18136441 has 4 divisors (see below), whose sum is σ = 18478692. Its totient is φ = 17794192.

The previous prime is 18136439. The next prime is 18136463. The reversal of 18136441 is 14463181.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9703225 + 8433216 = 3115^2 + 2904^2 .

It is a cyclic number.

It is not a de Polignac number, because 18136441 - 2¹ = 18136439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18136421) 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, 171046 + ... + 171151.

It is an arithmetic number, because the mean of its divisors is an integer number (4619673).

Almost surely, 2^18136441 is an apocalyptic number.

It is an amenable number.

18136441 is a deficient number, since it is larger than the sum of its proper divisors (342251).

18136441 is an equidigital number, since it uses as much as digits as its factorization.

18136441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342250.

The product of its digits is 2304, while the sum is 28.

The square root of 18136441 is about 4258.6900568132. The cubic root of 18136441 is about 262.7346521592.

The spelling of 18136441 in words is "eighteen million, one hundred thirty-six thousand, four hundred forty-one".