18609623 has 2 divisors, whose sum is σ = 18609624. Its totient is φ = 18609622.

The previous prime is 18609601. The next prime is 18609637. The reversal of 18609623 is 32690681.

It is a strong prime.

It is an emirp because it is prime and its reverse (32690681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18609623 - 2⁶ = 18609559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18609673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9304811 + 9304812.

It is an arithmetic number, because the mean of its divisors is an integer number (9304812).

Almost surely, 2^18609623 is an apocalyptic number.

18609623 is a deficient number, since it is larger than the sum of its proper divisors (1).

18609623 is an equidigital number, since it uses as much as digits as its factorization.

18609623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 18609623 is about 4313.8872261569. The cubic root of 18609623 is about 264.9999905067. Note that the first 5 decimals are identical.

The spelling of 18609623 in words is "eighteen million, six hundred nine thousand, six hundred twenty-three".