18058729 has 4 divisors (see below), whose sum is σ = 19447876. Its totient is φ = 16669584.

The previous prime is 18058727. The next prime is 18058769. The reversal of 18058729 is 92785081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92785081 = 89 ⋅1042529.

It can be written as a sum of positive squares in 2 ways, for example, as 3027600 + 15031129 = 1740^2 + 3877^2 .

It is a cyclic number.

It is not a de Polignac number, because 18058729 - 2¹ = 18058727 is a prime.

It is a super-2 number, since 2×18058729² = 652235386190882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18058691 and 18058700.

It is not an unprimeable number, because it can be changed into a prime (18058727) 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 3 ways as a sum of consecutive naturals, for example, 694554 + ... + 694579.

It is an arithmetic number, because the mean of its divisors is an integer number (4861969).

Almost surely, 2^18058729 is an apocalyptic number.

It is an amenable number.

18058729 is a deficient number, since it is larger than the sum of its proper divisors (1389147).

18058729 is a wasteful number, since it uses less digits than its factorization.

18058729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1389146.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 18058729 is about 4249.5563297831. The cubic root of 18058729 is about 262.3588550352.

The spelling of 18058729 in words is "eighteen million, fifty-eight thousand, seven hundred twenty-nine".