18345641 has 4 divisors (see below), whose sum is σ = 18377172. Its totient is φ = 18314112.

The previous prime is 18345581. The next prime is 18345653. The reversal of 18345641 is 14654381.

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 6270016 + 12075625 = 2504^2 + 3475^2 .

It is a cyclic number.

It is not a de Polignac number, because 18345641 - 2⁶ = 18345577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18345598 and 18345607.

It is not an unprimeable number, because it can be changed into a prime (18345671) 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, 14876 + ... + 16061.

It is an arithmetic number, because the mean of its divisors is an integer number (4594293).

Almost surely, 2^18345641 is an apocalyptic number.

It is an amenable number.

18345641 is a deficient number, since it is larger than the sum of its proper divisors (31531).

18345641 is an equidigital number, since it uses as much as digits as its factorization.

18345641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31530.

The product of its digits is 11520, while the sum is 32.

The square root of 18345641 is about 4283.1811775828. The cubic root of 18345641 is about 263.7409888882.

The spelling of 18345641 in words is "eighteen million, three hundred forty-five thousand, six hundred forty-one".