18683387 has 2 divisors, whose sum is σ = 18683388. Its totient is φ = 18683386.

The previous prime is 18683369. The next prime is 18683389. The reversal of 18683387 is 78338681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18683387 - 2¹² = 18679291 is a prime.

Together with 18683389, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18683389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9341693 + 9341694.

It is an arithmetic number, because the mean of its divisors is an integer number (9341694).

Almost surely, 2^18683387 is an apocalyptic number.

18683387 is a deficient number, since it is larger than the sum of its proper divisors (1).

18683387 is an equidigital number, since it uses as much as digits as its factorization.

18683387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 44.

The square root of 18683387 is about 4322.4283684059. The cubic root of 18683387 is about 265.3496606551.

The spelling of 18683387 in words is "eighteen million, six hundred eighty-three thousand, three hundred eighty-seven".