55447 has 6 divisors (see below), whose sum is σ = 64088. Its totient is φ = 46992.

The previous prime is 55441. The next prime is 55457. The reversal of 55447 is 74455.

It is not a de Polignac number, because 55447 - 2³ = 55439 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 579 + ... + 667.

2⁵⁵⁴⁴⁷ is an apocalyptic number.

55447 is a deficient number, since it is larger than the sum of its proper divisors (8641).

55447 is an frugal number, since it uses more digits than its factorization.

55447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185 (or 96 counting only the distinct ones).

The product of its digits is 2800, while the sum is 25.

The square root of 55447 is about 235.4718666847. The cubic root of 55447 is about 38.1322721951.

Multiplying 55447 by its product of digits (2800), we get a square (155251600 = 12460²).

The spelling of 55447 in words is "fifty-five thousand, four hundred forty-seven".