3705729 has 4 divisors (see below), whose sum is σ = 4940976. Its totient is φ = 2470484.

The previous prime is 3705719. The next prime is 3705739. The reversal of 3705729 is 9275073.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (3705719) and next prime (3705739).

It is a cyclic number.

It is not a de Polignac number, because 3705729 - 2¹⁵ = 3672961 is a prime.

It is a D-number.

3705729 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3705729.

It is not an unprimeable number, because it can be changed into a prime (3705719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 617619 + ... + 617624.

It is an arithmetic number, because the mean of its divisors is an integer number (1235244).

Almost surely, 2^3705729 is an apocalyptic number.

It is an amenable number.

3705729 is a deficient number, since it is larger than the sum of its proper divisors (1235247).

3705729 is a wasteful number, since it uses less digits than its factorization.

3705729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235246.

The product of its (nonzero) digits is 13230, while the sum is 33.

The square root of 3705729 is about 1925.0270127975. The cubic root of 3705729 is about 154.7478244261.

The spelling of 3705729 in words is "three million, seven hundred five thousand, seven hundred twenty-nine".