3906729 has 6 divisors (see below), whose sum is σ = 5643066. Its totient is φ = 2604480.

The previous prime is 3906709. The next prime is 3906731. The reversal of 3906729 is 9276093.

It can be written as a sum of positive squares in only one way, i.e., 3069504 + 837225 = 1752^2 + 915^2 .

It is not a de Polignac number, because 3906729 - 2⁵ = 3906697 is a prime.

It is a Curzon number.

3906729 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3906693 and 3906702.

It is not an unprimeable number, because it can be changed into a prime (3906709) 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 5 ways as a sum of consecutive naturals, for example, 217032 + ... + 217049.

It is an arithmetic number, because the mean of its divisors is an integer number (940511).

Almost surely, 2^3906729 is an apocalyptic number.

It is an amenable number.

3906729 is a deficient number, since it is larger than the sum of its proper divisors (1736337).

3906729 is a wasteful number, since it uses less digits than its factorization.

3906729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434087 (or 434084 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 3906729 is about 1976.5447123706. The cubic root of 3906729 is about 157.4965683304.

The spelling of 3906729 in words is "three million, nine hundred six thousand, seven hundred twenty-nine".