18853 has 4 divisors (see below), whose sum is σ = 19980. Its totient is φ = 17728.

The previous prime is 18839. The next prime is 18859. The reversal of 18853 is 35881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35881 = 53 ⋅677.

It can be written as a sum of positive squares in 2 ways, for example, as 6084 + 12769 = 78^2 + 113^2 .

It is a cyclic number.

It is not a de Polignac number, because 18853 - 2⁹ = 18341 is a prime.

It is a Duffinian number.

18853 is a lucky number.

It is a plaindrome in base 15.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 538 + ... + 571.

It is an arithmetic number, because the mean of its divisors is an integer number (4995).

2¹⁸⁸⁵³ is an apocalyptic number.

It is an amenable number.

18853 is a deficient number, since it is larger than the sum of its proper divisors (1127).

18853 is a wasteful number, since it uses less digits than its factorization.

18853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126.

The product of its digits is 960, while the sum is 25.

The square root of 18853 is about 137.3062270984. The cubic root of 18853 is about 26.6150215718.

The spelling of 18853 in words is "eighteen thousand, eight hundred fifty-three".