18736849 has 2 divisors, whose sum is σ = 18736850. Its totient is φ = 18736848.

The previous prime is 18736847. The next prime is 18736853. The reversal of 18736849 is 94863781.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14493249 + 4243600 = 3807^2 + 2060^2 .

It is a cyclic number.

It is not a de Polignac number, because 18736849 - 2¹ = 18736847 is a prime.

Together with 18736847, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 18736799 and 18736808.

It is not a weakly prime, because it can be changed into another prime (18736841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9368424 + 9368425.

It is an arithmetic number, because the mean of its divisors is an integer number (9368425).

Almost surely, 2^18736849 is an apocalyptic number.

It is an amenable number.

18736849 is a deficient number, since it is larger than the sum of its proper divisors (1).

18736849 is an equidigital number, since it uses as much as digits as its factorization.

18736849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 46.

The square root of 18736849 is about 4328.6082058787. The cubic root of 18736849 is about 265.6025165560.

The spelling of 18736849 in words is "eighteen million, seven hundred thirty-six thousand, eight hundred forty-nine".