549972 has 18 divisors (see below), whose sum is σ = 1390298. Its totient is φ = 183312.

The previous prime is 549949. The next prime is 549977. The reversal of 549972 is 279945.

It can be written as a sum of positive squares in only one way, i.e., 352836 + 197136 = 594^2 + 444^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 15277 = 549972 / (5 + 4 + 9 + 9 + 7 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549977) by changing a digit.

549972 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 in 5 ways as a sum of consecutive naturals, for example, 7603 + ... + 7674.

2⁵⁴⁹⁹⁷² is an apocalyptic number.

It is an amenable number.

549972 is an abundant number, since it is smaller than the sum of its proper divisors (840326).

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

549972 is a wasteful number, since it uses less digits than its factorization.

549972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15287 (or 15282 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 549972 is about 741.6009708732. The cubic root of 549972 is about 81.9307366731.

It can be divided in two parts, 549 and 972, that added together give a square (1521 = 39²).

The spelling of 549972 in words is "five hundred forty-nine thousand, nine hundred seventy-two".