40447 has 4 divisors (see below), whose sum is σ = 44136. Its totient is φ = 36760.

The previous prime is 40433. The next prime is 40459. The reversal of 40447 is 74404.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40447 is a prime.

It is a Duffinian number.

40447 is a lucky number.

It is a plaindrome in base 8 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40427) 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 3 ways as a sum of consecutive naturals, for example, 1828 + ... + 1849.

It is an arithmetic number, because the mean of its divisors is an integer number (11034).

2⁴⁰⁴⁴⁷ is an apocalyptic number.

40447 is the 108-th centered heptagonal number.

40447 is a deficient number, since it is larger than the sum of its proper divisors (3689).

40447 is a wasteful number, since it uses less digits than its factorization.

40447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3688.

The product of its (nonzero) digits is 448, while the sum is 19.

The square root of 40447 is about 201.1143953077. The cubic root of 40447 is about 34.3264405262.

The spelling of 40447 in words is "forty thousand, four hundred forty-seven", and thus it is an iban number.