18858923 has 2 divisors, whose sum is σ = 18858924. Its totient is φ = 18858922.

The previous prime is 18858911. The next prime is 18858929. The reversal of 18858923 is 32985881.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18858923 - 2⁴ = 18858907 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (18858929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9429461 + 9429462.

It is an arithmetic number, because the mean of its divisors is an integer number (9429462).

Almost surely, 2^18858923 is an apocalyptic number.

18858923 is a deficient number, since it is larger than the sum of its proper divisors (1).

18858923 is an equidigital number, since it uses as much as digits as its factorization.

18858923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 44.

The square root of 18858923 is about 4342.6861502991. The cubic root of 18858923 is about 266.1780847158.

The spelling of 18858923 in words is "eighteen million, eight hundred fifty-eight thousand, nine hundred twenty-three".