18272473 has 2 divisors, whose sum is σ = 18272474. Its totient is φ = 18272472.

The previous prime is 18272459. The next prime is 18272491. The reversal of 18272473 is 37427281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15303744 + 2968729 = 3912^2 + 1723^2 .

It is a cyclic number.

It is not a de Polignac number, because 18272473 - 2²¹ = 16175321 is a prime.

It is not a weakly prime, because it can be changed into another prime (18272453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9136236 + 9136237.

It is an arithmetic number, because the mean of its divisors is an integer number (9136237).

Almost surely, 2^18272473 is an apocalyptic number.

It is an amenable number.

18272473 is a deficient number, since it is larger than the sum of its proper divisors (1).

18272473 is an equidigital number, since it uses as much as digits as its factorization.

18272473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18816, while the sum is 34.

The square root of 18272473 is about 4274.6313291324. The cubic root of 18272473 is about 263.3898952723.

The spelling of 18272473 in words is "eighteen million, two hundred seventy-two thousand, four hundred seventy-three".