3665729 has 4 divisors (see below), whose sum is σ = 3727920. Its totient is φ = 3603540.

The previous prime is 3665677. The next prime is 3665731. The reversal of 3665729 is 9275663.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9275663 = 2927 ⋅3169.

It is a cyclic number.

It is not a de Polignac number, because 3665729 - 2¹² = 3661633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3665692 and 3665701.

It is not an unprimeable number, because it can be changed into a prime (3665759) 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, 31007 + ... + 31124.

It is an arithmetic number, because the mean of its divisors is an integer number (931980).

Almost surely, 2^3665729 is an apocalyptic number.

It is an amenable number.

3665729 is a deficient number, since it is larger than the sum of its proper divisors (62191).

3665729 is an equidigital number, since it uses as much as digits as its factorization.

3665729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62190.

The product of its digits is 68040, while the sum is 38.

The square root of 3665729 is about 1914.6093596345. The cubic root of 3665729 is about 154.1890212856.

The spelling of 3665729 in words is "three million, six hundred sixty-five thousand, seven hundred twenty-nine".