18160729 has 2 divisors, whose sum is σ = 18160730. Its totient is φ = 18160728.

The previous prime is 18160697. The next prime is 18160739. The reversal of 18160729 is 92706181.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18079504 + 81225 = 4252^2 + 285^2 .

It is an emirp because it is prime and its reverse (92706181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18160729 - 2⁵ = 18160697 is a prime.

It is a super-2 number, since 2×18160729² = 659624155622882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18160694 and 18160703.

It is not a weakly prime, because it can be changed into another prime (18160739) 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, 9080364 + 9080365.

It is an arithmetic number, because the mean of its divisors is an integer number (9080365).

Almost surely, 2^18160729 is an apocalyptic number.

It is an amenable number.

18160729 is a deficient number, since it is larger than the sum of its proper divisors (1).

18160729 is an equidigital number, since it uses as much as digits as its factorization.

18160729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 18160729 is about 4261.5406838372. The cubic root of 18160729 is about 262.8518830385.

The spelling of 18160729 in words is "eighteen million, one hundred sixty thousand, seven hundred twenty-nine".