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55423 = 192917

55423 has 4 divisors (see below), whose sum is σ = 58360. Its totient is φ = 52488.

The previous prime is 55411. The next prime is 55439. The reversal of 55423 is 32455.

Adding to 55423 its reverse (32455), we get a palindrome (87878).

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32455 = 56491.

It is a 4-Lehmer number, since φ(55423) divides (55423-1)4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-55423 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 2917 = 55423 / (5 + 5 + 4 + 2 + 3).

It is a Duffinian number.

55423 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 55423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1440 + ... + 1477.

It is an arithmetic number, because the mean of its divisors is an integer number (14590).

255423 is an apocalyptic number.

55423 is a deficient number, since it is larger than the sum of its proper divisors (2937).

55423 is a wasteful number, since it uses less digits than its factorization.

55423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2936.

The product of its digits is 600, while the sum is 19.

The square root of 55423 is about 235.4208996670. The cubic root of 55423 is about 38.1267696034.

The spelling of 55423 in words is "fifty-five thousand, four hundred twenty-three".

Divisors: 1 19 2917 55423