18263849 has 2 divisors, whose sum is σ = 18263850. Its totient is φ = 18263848.

The previous prime is 18263837. The next prime is 18263879. The reversal of 18263849 is 94836281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17909824 + 354025 = 4232^2 + 595^2 .

It is an emirp because it is prime and its reverse (94836281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18263849 - 2¹² = 18259753 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18263809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9131924 + 9131925.

It is an arithmetic number, because the mean of its divisors is an integer number (9131925).

Almost surely, 2^18263849 is an apocalyptic number.

It is an amenable number.

18263849 is a deficient number, since it is larger than the sum of its proper divisors (1).

18263849 is an equidigital number, since it uses as much as digits as its factorization.

18263849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 41.

The square root of 18263849 is about 4273.6224681177. The cubic root of 18263849 is about 263.3484516592.

The spelling of 18263849 in words is "eighteen million, two hundred sixty-three thousand, eight hundred forty-nine".