18646673 has 2 divisors, whose sum is σ = 18646674. Its totient is φ = 18646672.

The previous prime is 18646669. The next prime is 18646679. The reversal of 18646673 is 37664681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17497489 + 1149184 = 4183^2 + 1072^2 .

It is a cyclic number.

It is not a de Polignac number, because 18646673 - 2² = 18646669 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18646673.

It is not a weakly prime, because it can be changed into another prime (18646679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9323336 + 9323337.

It is an arithmetic number, because the mean of its divisors is an integer number (9323337).

Almost surely, 2^18646673 is an apocalyptic number.

It is an amenable number.

18646673 is a deficient number, since it is larger than the sum of its proper divisors (1).

18646673 is an equidigital number, since it uses as much as digits as its factorization.

18646673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 41.

The square root of 18646673 is about 4318.1793617218. The cubic root of 18646673 is about 265.1757372357.

The spelling of 18646673 in words is "eighteen million, six hundred forty-six thousand, six hundred seventy-three".