18840307 has 2 divisors, whose sum is σ = 18840308. Its totient is φ = 18840306.

The previous prime is 18840271. The next prime is 18840331. The reversal of 18840307 is 70304881.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (70304881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18840307 - 2⁷ = 18840179 is a prime.

It is not a weakly prime, because it can be changed into another prime (18840397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9420153 + 9420154.

It is an arithmetic number, because the mean of its divisors is an integer number (9420154).

Almost surely, 2^18840307 is an apocalyptic number.

18840307 is a deficient number, since it is larger than the sum of its proper divisors (1).

18840307 is an equidigital number, since it uses as much as digits as its factorization.

18840307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 18840307 is about 4340.5422472313. The cubic root of 18840307 is about 266.0904727391.

The spelling of 18840307 in words is "eighteen million, eight hundred forty thousand, three hundred seven".