42447 has 4 divisors (see below), whose sum is σ = 56600. Its totient is φ = 28296.

The previous prime is 42443. The next prime is 42451. The reversal of 42447 is 74424.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (42443) and next prime (42451).

It is not a de Polignac number, because 42447 - 2² = 42443 is a prime.

It is a D-number.

It is a Duffinian number.

42447 is a lucky number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42443) 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, 7072 + ... + 7077.

It is an arithmetic number, because the mean of its divisors is an integer number (14150).

2⁴²⁴⁴⁷ is an apocalyptic number.

42447 is a deficient number, since it is larger than the sum of its proper divisors (14153).

42447 is a wasteful number, since it uses less digits than its factorization.

42447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14152.

The product of its digits is 896, while the sum is 21.

The square root of 42447 is about 206.0266972992. The cubic root of 42447 is about 34.8831477218.

The spelling of 42447 in words is "forty-two thousand, four hundred forty-seven", and thus it is an iban number.