549690 has 32 divisors (see below), whose sum is σ = 1342656. Its totient is φ = 144000.

The previous prime is 549683. The next prime is 549691. The reversal of 549690 is 96945.

It is a happy number.

It is a super-2 number, since 2×549690² = 604318192200, which contains 22 as substring.

It is an Ulam number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549691) by changing a digit.

549690 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 15 ways as a sum of consecutive naturals, for example, 2065 + ... + 2315.

It is an arithmetic number, because the mean of its divisors is an integer number (41958).

2⁵⁴⁹⁶⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 549690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (671328).

549690 is an abundant number, since it is smaller than the sum of its proper divisors (792966).

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

549690 is a wasteful number, since it uses less digits than its factorization.

549690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 549690 is about 741.4108172936. The cubic root of 549690 is about 81.9167308584.

The spelling of 549690 in words is "five hundred forty-nine thousand, six hundred ninety".