549905 has 8 divisors (see below), whose sum is σ = 666600. Its totient is φ = 435456.

The previous prime is 549883. The next prime is 549911. The reversal of 549905 is 509945.

It can be written as a sum of positive squares in 4 ways, for example, as 55696 + 494209 = 236^2 + 703^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 549905 - 2⁸ = 549649 is a prime.

It is a nialpdrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 549905.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41 + ... + 1049.

It is an arithmetic number, because the mean of its divisors is an integer number (83325).

2⁵⁴⁹⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

549905 is a deficient number, since it is larger than the sum of its proper divisors (116695).

549905 is a wasteful number, since it uses less digits than its factorization.

549905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1123.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 549905 is about 741.5557969566. Note that the first 3 decimals coincide. The cubic root of 549905 is about 81.9274094842.

The spelling of 549905 in words is "five hundred forty-nine thousand, nine hundred five".