18449549 has 4 divisors (see below), whose sum is σ = 18899580. Its totient is φ = 17999520.

The previous prime is 18449533. The next prime is 18449567. The reversal of 18449549 is 94594481.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10355524 + 8094025 = 3218^2 + 2845^2 .

It is a cyclic number.

It is not a de Polignac number, because 18449549 - 2⁴ = 18449533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18449579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224954 + ... + 225035.

It is an arithmetic number, because the mean of its divisors is an integer number (4724895).

Almost surely, 2^18449549 is an apocalyptic number.

It is an amenable number.

18449549 is a deficient number, since it is larger than the sum of its proper divisors (450031).

18449549 is an equidigital number, since it uses as much as digits as its factorization.

18449549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450030.

The product of its digits is 207360, while the sum is 44.

The square root of 18449549 is about 4295.2938199848. The cubic root of 18449549 is about 264.2379865394.

The spelling of 18449549 in words is "eighteen million, four hundred forty-nine thousand, five hundred forty-nine".