18682397 has 2 divisors, whose sum is σ = 18682398. Its totient is φ = 18682396.

The previous prime is 18682393. The next prime is 18682399. The reversal of 18682397 is 79328681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14638276 + 4044121 = 3826^2 + 2011^2 .

It is a cyclic number.

It is not a de Polignac number, because 18682397 - 2² = 18682393 is a prime.

Together with 18682399, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18682393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9341198 + 9341199.

It is an arithmetic number, because the mean of its divisors is an integer number (9341199).

Almost surely, 2^18682397 is an apocalyptic number.

It is an amenable number.

18682397 is a deficient number, since it is larger than the sum of its proper divisors (1).

18682397 is an equidigital number, since it uses as much as digits as its factorization.

18682397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The square root of 18682397 is about 4322.3138479291. The cubic root of 18682397 is about 265.3449737675.

The spelling of 18682397 in words is "eighteen million, six hundred eighty-two thousand, three hundred ninety-seven".