549636 has 24 divisors (see below), whose sum is σ = 1294944. Its totient is φ = 181440.

The previous prime is 549623. The next prime is 549641. The reversal of 549636 is 636945.

It is a happy number.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 549597 and 549606.

It is an unprimeable number.

549636 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1816 + ... + 2096.

It is an arithmetic number, because the mean of its divisors is an integer number (53956).

2⁵⁴⁹⁶³⁶ is an apocalyptic number.

It is an amenable number.

549636 is an abundant number, since it is smaller than the sum of its proper divisors (745308).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

549636 is a wasteful number, since it uses less digits than its factorization.

549636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451 (or 449 counting only the distinct ones).

The product of its digits is 19440, while the sum is 33.

The square root of 549636 is about 741.3743993422. The cubic root of 549636 is about 81.9140483474.

The spelling of 549636 in words is "five hundred forty-nine thousand, six hundred thirty-six".