18861307 has 2 divisors, whose sum is σ = 18861308. Its totient is φ = 18861306.

The previous prime is 18861301. The next prime is 18861331. The reversal of 18861307 is 70316881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18861307 - 2¹¹ = 18859259 is a prime.

It is not a weakly prime, because it can be changed into another prime (18861301) 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, 9430653 + 9430654.

It is an arithmetic number, because the mean of its divisors is an integer number (9430654).

Almost surely, 2^18861307 is an apocalyptic number.

18861307 is a deficient number, since it is larger than the sum of its proper divisors (1).

18861307 is an equidigital number, since it uses as much as digits as its factorization.

18861307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 18861307 is about 4342.9606261167. The cubic root of 18861307 is about 266.1893003053.

The spelling of 18861307 in words is "eighteen million, eight hundred sixty-one thousand, three hundred seven".