18275729 has 2 divisors, whose sum is σ = 18275730. Its totient is φ = 18275728.

The previous prime is 18275717. The next prime is 18275737. The reversal of 18275729 is 92757281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17850625 + 425104 = 4225^2 + 652^2 .

It is an emirp because it is prime and its reverse (92757281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18275729 - 2²⁴ = 1498513 is a prime.

It is not a weakly prime, because it can be changed into another prime (18275779) 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, 9137864 + 9137865.

It is an arithmetic number, because the mean of its divisors is an integer number (9137865).

Almost surely, 2^18275729 is an apocalyptic number.

It is an amenable number.

18275729 is a deficient number, since it is larger than the sum of its proper divisors (1).

18275729 is an equidigital number, since it uses as much as digits as its factorization.

18275729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 41.

The square root of 18275729 is about 4275.0121637254. The cubic root of 18275729 is about 263.4055389597.

The spelling of 18275729 in words is "eighteen million, two hundred seventy-five thousand, seven hundred twenty-nine".