18643453 has 4 divisors (see below), whose sum is σ = 18853020. Its totient is φ = 18433888.

The previous prime is 18643423. The next prime is 18643459. The reversal of 18643453 is 35434681.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35434681 = 17 ⋅2084393.

It can be written as a sum of positive squares in 2 ways, for example, as 7171684 + 11471769 = 2678^2 + 3387^2 .

It is a cyclic number.

It is not a de Polignac number, because 18643453 - 2⁵ = 18643421 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 (18643459) 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, 104650 + ... + 104827.

It is an arithmetic number, because the mean of its divisors is an integer number (4713255).

Almost surely, 2^18643453 is an apocalyptic number.

It is an amenable number.

18643453 is a deficient number, since it is larger than the sum of its proper divisors (209567).

18643453 is an equidigital number, since it uses as much as digits as its factorization.

18643453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209566.

The product of its digits is 34560, while the sum is 34.

The square root of 18643453 is about 4317.8065033070. The cubic root of 18643453 is about 265.1604724030.

The spelling of 18643453 in words is "eighteen million, six hundred forty-three thousand, four hundred fifty-three".