549138 has 16 divisors (see below), whose sum is σ = 1156320. Its totient is φ = 173376.

The previous prime is 549121. The next prime is 549139. The reversal of 549138 is 831945.

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 549138.

It is not an unprimeable number, because it can be changed into a prime (549139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2295 + ... + 2522.

It is an arithmetic number, because the mean of its divisors is an integer number (72270).

2⁵⁴⁹¹³⁸ is an apocalyptic number.

549138 is an abundant number, since it is smaller than the sum of its proper divisors (607182).

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

549138 is a wasteful number, since it uses less digits than its factorization.

549138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4841.

The product of its digits is 4320, while the sum is 30.

The square root of 549138 is about 741.0384605403. The cubic root of 549138 is about 81.8893013497.

The spelling of 549138 in words is "five hundred forty-nine thousand, one hundred thirty-eight".