18201923 has 2 divisors, whose sum is σ = 18201924. Its totient is φ = 18201922.

The previous prime is 18201907. The next prime is 18201941. The reversal of 18201923 is 32910281.

It is a weak prime.

It is an emirp because it is prime and its reverse (32910281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18201923 - 2⁴ = 18201907 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18201892 and 18201901.

It is not a weakly prime, because it can be changed into another prime (18201223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9100961 + 9100962.

It is an arithmetic number, because the mean of its divisors is an integer number (9100962).

Almost surely, 2^18201923 is an apocalyptic number.

18201923 is a deficient number, since it is larger than the sum of its proper divisors (1).

18201923 is an equidigital number, since it uses as much as digits as its factorization.

18201923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 18201923 is about 4266.3711746635. The cubic root of 18201923 is about 263.0504753560.

The spelling of 18201923 in words is "eighteen million, two hundred one thousand, nine hundred twenty-three".