18306473 has 2 divisors, whose sum is σ = 18306474. Its totient is φ = 18306472.

The previous prime is 18306451. The next prime is 18306493. The reversal of 18306473 is 37460381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15784729 + 2521744 = 3973^2 + 1588^2 .

It is a cyclic number.

It is not a de Polignac number, because 18306473 - 2⁸ = 18306217 is a prime.

It is not a weakly prime, because it can be changed into another prime (18306403) 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, 9153236 + 9153237.

It is an arithmetic number, because the mean of its divisors is an integer number (9153237).

Almost surely, 2^18306473 is an apocalyptic number.

It is an amenable number.

18306473 is a deficient number, since it is larger than the sum of its proper divisors (1).

18306473 is an equidigital number, since it uses as much as digits as its factorization.

18306473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 18306473 is about 4278.6064320056. The cubic root of 18306473 is about 263.5531592114.

The spelling of 18306473 in words is "eighteen million, three hundred six thousand, four hundred seventy-three".