18286649 has 2 divisors, whose sum is σ = 18286650. Its totient is φ = 18286648.

The previous prime is 18286613. The next prime is 18286651. The reversal of 18286649 is 94668281.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11343424 + 6943225 = 3368^2 + 2635^2 .

It is a cyclic number.

It is not a de Polignac number, because 18286649 - 2⁸ = 18286393 is a prime.

Together with 18286651, 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 (18286699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9143324 + 9143325.

It is an arithmetic number, because the mean of its divisors is an integer number (9143325).

Almost surely, 2^18286649 is an apocalyptic number.

It is an amenable number.

18286649 is a deficient number, since it is larger than the sum of its proper divisors (1).

18286649 is an equidigital number, since it uses as much as digits as its factorization.

18286649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 44.

The square root of 18286649 is about 4276.2891623463. The cubic root of 18286649 is about 263.4579913275.

The spelling of 18286649 in words is "eighteen million, two hundred eighty-six thousand, six hundred forty-nine".