3685729 has 2 divisors, whose sum is σ = 3685730. Its totient is φ = 3685728.

The previous prime is 3685699. The next prime is 3685739. The reversal of 3685729 is 9275863.

3685729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3069504 + 616225 = 1752^2 + 785^2 .

It is a cyclic number.

It is not a de Polignac number, because 3685729 - 2¹³ = 3677537 is a prime.

It is a super-2 number, since 2×3685729² = 27169196522882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3685691 and 3685700.

It is not a weakly prime, because it can be changed into another prime (3685739) 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, 1842864 + 1842865.

It is an arithmetic number, because the mean of its divisors is an integer number (1842865).

Almost surely, 2^3685729 is an apocalyptic number.

It is an amenable number.

3685729 is a deficient number, since it is larger than the sum of its proper divisors (1).

3685729 is an equidigital number, since it uses as much as digits as its factorization.

3685729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 40.

The square root of 3685729 is about 1919.8252524644. The cubic root of 3685729 is about 154.4689282341.

The spelling of 3685729 in words is "three million, six hundred eighty-five thousand, seven hundred twenty-nine".