550399 has 4 divisors (see below), whose sum is σ = 552664. Its totient is φ = 548136.

The previous prime is 550379. The next prime is 550427. The reversal of 550399 is 993055.

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

It is a cyclic number.

It is not a de Polignac number, because 550399 - 2¹¹ = 548351 is a prime.

It is a Duffinian number.

550399 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 550399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550309) 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, 717 + ... + 1270.

It is an arithmetic number, because the mean of its divisors is an integer number (138166).

2⁵⁵⁰³⁹⁹ is an apocalyptic number.

550399 is a deficient number, since it is larger than the sum of its proper divisors (2265).

550399 is a wasteful number, since it uses less digits than its factorization.

550399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2264.

The product of its (nonzero) digits is 6075, while the sum is 31.

The square root of 550399 is about 741.8888056845. Note that the first 4 decimals coincide. The cubic root of 550399 is about 81.9519349489.

It can be divided in two parts, 550 and 399, that added together give a palindrome (949).

The spelling of 550399 in words is "five hundred fifty thousand, three hundred ninety-nine".