18049589 has 4 divisors (see below), whose sum is σ = 18058956. Its totient is φ = 18040224.

The previous prime is 18049583. The next prime is 18049607. The reversal of 18049589 is 98594081.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 98594081 = 811 ⋅121571.

It can be written as a sum of positive squares in 2 ways, for example, as 9394225 + 8655364 = 3065^2 + 2942^2 .

It is a cyclic number.

It is not a de Polignac number, because 18049589 - 2⁸ = 18049333 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18049583) 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, 614 + ... + 6039.

It is an arithmetic number, because the mean of its divisors is an integer number (4514739).

Almost surely, 2^18049589 is an apocalyptic number.

It is an amenable number.

18049589 is a deficient number, since it is larger than the sum of its proper divisors (9367).

18049589 is an equidigital number, since it uses as much as digits as its factorization.

18049589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9366.

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 18049589 is about 4248.4807872933. The cubic root of 18049589 is about 262.3145853157.

The spelling of 18049589 in words is "eighteen million, forty-nine thousand, five hundred eighty-nine".