18083549 has 4 divisors (see below), whose sum is σ = 19727520. Its totient is φ = 16439580.

The previous prime is 18083539. The next prime is 18083561. The reversal of 18083549 is 94538081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94538081 = 11 ⋅8594371.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18083549 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 (18083519) 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, 821969 + ... + 821990.

It is an arithmetic number, because the mean of its divisors is an integer number (4931880).

Almost surely, 2^18083549 is an apocalyptic number.

It is an amenable number.

18083549 is a deficient number, since it is larger than the sum of its proper divisors (1643971).

18083549 is a wasteful number, since it uses less digits than its factorization.

18083549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1643970.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 18083549 is about 4252.4756319114. The cubic root of 18083549 is about 262.4789957494.

The spelling of 18083549 in words is "eighteen million, eighty-three thousand, five hundred forty-nine".