18456973 has 2 divisors, whose sum is σ = 18456974. Its totient is φ = 18456972.

The previous prime is 18456967. The next prime is 18456989. The reversal of 18456973 is 37965481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13380964 + 5076009 = 3658^2 + 2253^2 .

It is a cyclic number.

It is not a de Polignac number, because 18456973 - 2⁵ = 18456941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18456913) 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, 9228486 + 9228487.

It is an arithmetic number, because the mean of its divisors is an integer number (9228487).

Almost surely, 2^18456973 is an apocalyptic number.

It is an amenable number.

18456973 is a deficient number, since it is larger than the sum of its proper divisors (1).

18456973 is an equidigital number, since it uses as much as digits as its factorization.

18456973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 43.

The square root of 18456973 is about 4296.1579347133. The cubic root of 18456973 is about 264.2734244381.

The spelling of 18456973 in words is "eighteen million, four hundred fifty-six thousand, nine hundred seventy-three".