105447 has 4 divisors (see below), whose sum is σ = 140600. Its totient is φ = 70296.

The previous prime is 105437. The next prime is 105449. The reversal of 105447 is 744501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 744501 = 3 ⋅248167.

It is not a de Polignac number, because 105447 - 2⁷ = 105319 is a prime.

It is a super-2 number, since 2×105447² = 22238139618, which contains 22 as substring.

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 (105449) 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, 17572 + ... + 17577.

It is an arithmetic number, because the mean of its divisors is an integer number (35150).

2¹⁰⁵⁴⁴⁷ is an apocalyptic number.

105447 is a deficient number, since it is larger than the sum of its proper divisors (35153).

105447 is an equidigital number, since it uses as much as digits as its factorization.

105447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35152.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 105447 is about 324.7260383770. The cubic root of 105447 is about 47.2437913513.

Adding to 105447 its reverse (744501), we get a palindrome (849948).

The spelling of 105447 in words is "one hundred five thousand, four hundred forty-seven".