549404139 has 4 divisors (see below), whose sum is σ = 732538856. Its totient is φ = 366269424.

The previous prime is 549404131. The next prime is 549404143. The reversal of 549404139 is 931404945.

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

It is not a de Polignac number, because 549404139 - 2³ = 549404131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 549404097 and 549404106.

It is not an unprimeable number, because it can be changed into a prime (549404131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91567354 + ... + 91567359.

It is an arithmetic number, because the mean of its divisors is an integer number (183134714).

Almost surely, 2^549404139 is an apocalyptic number.

549404139 is a deficient number, since it is larger than the sum of its proper divisors (183134717).

549404139 is a wasteful number, since it uses less digits than its factorization.

549404139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183134716.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 549404139 is about 23439.3715572752. The cubic root of 549404139 is about 819.0252839334.

The spelling of 549404139 in words is "five hundred forty-nine million, four hundred four thousand, one hundred thirty-nine".