18398647 has 2 divisors, whose sum is σ = 18398648. Its totient is φ = 18398646.

The previous prime is 18398609. The next prime is 18398659. The reversal of 18398647 is 74689381.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18398647 - 2⁷ = 18398519 is a prime.

It is a super-2 number, since 2×18398647² = 677020422861218, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18398597 and 18398606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18398687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9199323 + 9199324.

It is an arithmetic number, because the mean of its divisors is an integer number (9199324).

Almost surely, 2^18398647 is an apocalyptic number.

18398647 is a deficient number, since it is larger than the sum of its proper divisors (1).

18398647 is an equidigital number, since it uses as much as digits as its factorization.

18398647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 46.

The square root of 18398647 is about 4289.3644051304. The cubic root of 18398647 is about 263.9947533010.

The spelling of 18398647 in words is "eighteen million, three hundred ninety-eight thousand, six hundred forty-seven".