549986 has 4 divisors (see below), whose sum is σ = 824982. Its totient is φ = 274992.

The previous prime is 549979. The next prime is 550007. The reversal of 549986 is 689945.

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

It can be written as a sum of positive squares in only one way, i.e., 534361 + 15625 = 731^2 + 125^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 549986.

It is an unprimeable number.

549986 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 (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137495 + ... + 137498.

2⁵⁴⁹⁹⁸⁶ is an apocalyptic number.

549986 is a deficient number, since it is larger than the sum of its proper divisors (274996).

549986 is a wasteful number, since it uses less digits than its factorization.

549986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274995.

The product of its digits is 77760, while the sum is 41.

The square root of 549986 is about 741.6104098514. The cubic root of 549986 is about 81.9314318725.

Subtracting from 549986 its sum of digits (41), we obtain a palindrome (549945).

The spelling of 549986 in words is "five hundred forty-nine thousand, nine hundred eighty-six".