18465973 has 2 divisors, whose sum is σ = 18465974. Its totient is φ = 18465972.

The previous prime is 18465947. The next prime is 18465989. The reversal of 18465973 is 37956481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18464209 + 1764 = 4297^2 + 42^2 .

It is a cyclic number.

It is not a de Polignac number, because 18465973 - 2¹³ = 18457781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18465773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9232986 + 9232987.

It is an arithmetic number, because the mean of its divisors is an integer number (9232987).

Almost surely, 2^18465973 is an apocalyptic number.

It is an amenable number.

18465973 is a deficient number, since it is larger than the sum of its proper divisors (1).

18465973 is an equidigital number, since it uses as much as digits as its factorization.

18465973 is an evil number, because the sum of its binary digits is even.

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

The square root of 18465973 is about 4297.2052545812. The cubic root of 18465973 is about 264.3163725121.

The spelling of 18465973 in words is "eighteen million, four hundred sixty-five thousand, nine hundred seventy-three".