18869549 has 2 divisors, whose sum is σ = 18869550. Its totient is φ = 18869548.

The previous prime is 18869503. The next prime is 18869569. The reversal of 18869549 is 94596881.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12709225 + 6160324 = 3565^2 + 2482^2 .

It is a cyclic number.

It is not a de Polignac number, because 18869549 - 2⁸ = 18869293 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18869497 and 18869506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18869569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9434774 + 9434775.

It is an arithmetic number, because the mean of its divisors is an integer number (9434775).

Almost surely, 2^18869549 is an apocalyptic number.

It is an amenable number.

18869549 is a deficient number, since it is larger than the sum of its proper divisors (1).

18869549 is an equidigital number, since it uses as much as digits as its factorization.

18869549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 50.

The square root of 18869549 is about 4343.9094143410. The cubic root of 18869549 is about 266.2280677269.

The spelling of 18869549 in words is "eighteen million, eight hundred sixty-nine thousand, five hundred forty-nine".