18180729 has 12 divisors (see below), whose sum is σ = 30012736. Its totient is φ = 10388952.

The previous prime is 18180719. The next prime is 18180731. The reversal of 18180729 is 92708181.

It is not a de Polignac number, because 18180729 - 2⁴ = 18180713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18180693 and 18180702.

It is not an unprimeable number, because it can be changed into a prime (18180719) 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 in 11 ways as a sum of consecutive naturals, for example, 144229 + ... + 144354.

Almost surely, 2^18180729 is an apocalyptic number.

It is an amenable number.

18180729 is a deficient number, since it is larger than the sum of its proper divisors (11832007).

18180729 is a wasteful number, since it uses less digits than its factorization.

18180729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288596 (or 288593 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 18180729 is about 4263.8866073103. The cubic root of 18180729 is about 262.9483385832.

The spelling of 18180729 in words is "eighteen million, one hundred eighty thousand, seven hundred twenty-nine".