81403 has 8 divisors (see below), whose sum is σ = 96480. Its totient is φ = 67200.

The previous prime is 81401. The next prime is 81409. The reversal of 81403 is 30418.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81403 - 2¹ = 81401 is a prime.

It is a Duffinian number.

81403 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3 + ... + 403.

It is an arithmetic number, because the mean of its divisors is an integer number (12060).

2⁸¹⁴⁰³ is an apocalyptic number.

81403 is a deficient number, since it is larger than the sum of its proper divisors (15077).

81403 is a wasteful number, since it uses less digits than its factorization.

81403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 81403 is about 285.3121098026. The cubic root of 81403 is about 43.3391248012.

It can be divided in two parts, 81 and 403, that added together give a palindrome (484).

The spelling of 81403 in words is "eighty-one thousand, four hundred three".