3681729 has 6 divisors (see below), whose sum is σ = 5318066. Its totient is φ = 2454480.

The previous prime is 3681719. The next prime is 3681731. The reversal of 3681729 is 9271863.

It can be written as a sum of positive squares in only one way, i.e., 2822400 + 859329 = 1680^2 + 927^2 .

It is not a de Polignac number, because 3681729 - 2⁵ = 3681697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3681693 and 3681702.

It is not an unprimeable number, because it can be changed into a prime (3681709) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 204532 + ... + 204549.

Almost surely, 2^3681729 is an apocalyptic number.

It is an amenable number.

3681729 is a deficient number, since it is larger than the sum of its proper divisors (1636337).

3681729 is a wasteful number, since it uses less digits than its factorization.

3681729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409087 (or 409084 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 3681729 is about 1918.7832081817. The cubic root of 3681729 is about 154.4130279977.

The spelling of 3681729 in words is "three million, six hundred eighty-one thousand, seven hundred twenty-nine".