550639 has 8 divisors (see below), whose sum is σ = 589040. Its totient is φ = 513216.

The previous prime is 550637. The next prime is 550651. The reversal of 550639 is 936055.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 6-Lehmer number, since φ(550639) divides (550639-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 550639 - 2¹ = 550637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1189 + ... + 1585.

It is an arithmetic number, because the mean of its divisors is an integer number (73630).

2⁵⁵⁰⁶³⁹ is an apocalyptic number.

550639 is the 397-th nonagonal number.

550639 is a deficient number, since it is larger than the sum of its proper divisors (38401).

550639 is a wasteful number, since it uses less digits than its factorization.

550639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489.

The product of its (nonzero) digits is 4050, while the sum is 28.

The square root of 550639 is about 742.0505373625. The cubic root of 550639 is about 81.9638448581.

The spelling of 550639 in words is "five hundred fifty thousand, six hundred thirty-nine".