18698807 has 2 divisors, whose sum is σ = 18698808. Its totient is φ = 18698806.

The previous prime is 18698791. The next prime is 18698891. The reversal of 18698807 is 70889681.

It is a weak prime.

It is an emirp because it is prime and its reverse (70889681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18698807 - 2⁴ = 18698791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18698107) 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, 9349403 + 9349404.

It is an arithmetic number, because the mean of its divisors is an integer number (9349404).

Almost surely, 2^18698807 is an apocalyptic number.

18698807 is a deficient number, since it is larger than the sum of its proper divisors (1).

18698807 is an equidigital number, since it uses as much as digits as its factorization.

18698807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 18698807 is about 4324.2117200711. The cubic root of 18698807 is about 265.4226411165.

The spelling of 18698807 in words is "eighteen million, six hundred ninety-eight thousand, eight hundred seven".