18453 has 4 divisors (see below), whose sum is σ = 24608. Its totient is φ = 12300.

The previous prime is 18451. The next prime is 18457. The reversal of 18453 is 35481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35481 = 3 ⋅11827.

It is not a de Polignac number, because 18453 - 2¹ = 18451 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3073 + ... + 3078.

It is an arithmetic number, because the mean of its divisors is an integer number (6152).

2¹⁸⁴⁵³ is an apocalyptic number.

It is an amenable number.

18453 is a deficient number, since it is larger than the sum of its proper divisors (6155).

18453 is an equidigital number, since it uses as much as digits as its factorization.

18453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6154.

The product of its digits is 480, while the sum is 21.

The square root of 18453 is about 135.8418197758. The cubic root of 18453 is about 26.4254460807.

The spelling of 18453 in words is "eighteen thousand, four hundred fifty-three".