18905923 has 2 divisors, whose sum is σ = 18905924. Its totient is φ = 18905922.

The previous prime is 18905869. The next prime is 18905963. The reversal of 18905923 is 32950981.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18905923 is a prime.

It is a nialpdrome in base 11.

It is not a weakly prime, because it can be changed into another prime (18905963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9452961 + 9452962.

It is an arithmetic number, because the mean of its divisors is an integer number (9452962).

Almost surely, 2^18905923 is an apocalyptic number.

18905923 is a deficient number, since it is larger than the sum of its proper divisors (1).

18905923 is an equidigital number, since it uses as much as digits as its factorization.

18905923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 18905923 is about 4348.0941802128. The cubic root of 18905923 is about 266.3990233065.

The spelling of 18905923 in words is "eighteen million, nine hundred five thousand, nine hundred twenty-three".