18676649 has 2 divisors, whose sum is σ = 18676650. Its totient is φ = 18676648.

The previous prime is 18676643. The next prime is 18676661. The reversal of 18676649 is 94667681.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11424400 + 7252249 = 3380^2 + 2693^2 .

It is a cyclic number.

It is not a de Polignac number, because 18676649 - 2⁴ = 18676633 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18676643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9338324 + 9338325.

It is an arithmetic number, because the mean of its divisors is an integer number (9338325).

Almost surely, 2^18676649 is an apocalyptic number.

It is an amenable number.

18676649 is a deficient number, since it is larger than the sum of its proper divisors (1).

18676649 is an equidigital number, since it uses as much as digits as its factorization.

18676649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 47.

The square root of 18676649 is about 4321.6488751401. The cubic root of 18676649 is about 265.3177581421.

The spelling of 18676649 in words is "eighteen million, six hundred seventy-six thousand, six hundred forty-nine".