18609923 has 2 divisors, whose sum is σ = 18609924. Its totient is φ = 18609922.

The previous prime is 18609919. The next prime is 18609931. The reversal of 18609923 is 32990681.

It is a weak prime.

It is an emirp because it is prime and its reverse (32990681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18609923 - 2² = 18609919 is a prime.

It is not a weakly prime, because it can be changed into another prime (18609973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9304961 + 9304962.

It is an arithmetic number, because the mean of its divisors is an integer number (9304962).

Almost surely, 2^18609923 is an apocalyptic number.

18609923 is a deficient number, since it is larger than the sum of its proper divisors (1).

18609923 is an equidigital number, since it uses as much as digits as its factorization.

18609923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 18609923 is about 4313.9219974404. The cubic root of 18609923 is about 265.0014144935.

The spelling of 18609923 in words is "eighteen million, six hundred nine thousand, nine hundred twenty-three".