55424 has 16 divisors (see below), whose sum is σ = 110670. Its totient is φ = 27648.

The previous prime is 55411. The next prime is 55439. The reversal of 55424 is 42455.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 53824 + 1600 = 232^2 + 40^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 55396 and 55405.

It is a congruent number.

It is an unprimeable number.

55424 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 89 + ... + 344.

2⁵⁵⁴²⁴ is an apocalyptic number.

It is an amenable number.

55424 is a deficient number, since it is larger than the sum of its proper divisors (55246).

55424 is an equidigital number, since it uses as much as digits as its factorization.

55424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447 (or 435 counting only the distinct ones).

The product of its digits is 800, while the sum is 20.

The square root of 55424 is about 235.4230235130. The cubic root of 55424 is about 38.1269989098.

Adding to 55424 its reverse (42455), we get a palindrome (97879).

The spelling of 55424 in words is "fifty-five thousand, four hundred twenty-four".