3665129 has 4 divisors (see below), whose sum is σ = 3947076. Its totient is φ = 3383184.

The previous prime is 3665117. The next prime is 3665131. The reversal of 3665129 is 9215663.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9215663 = 23 ⋅400681.

It can be written as a sum of positive squares in 2 ways, for example, as 1345600 + 2319529 = 1160^2 + 1523^2 .

It is a cyclic number.

It is not a de Polignac number, because 3665129 - 2⁸ = 3664873 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 = 3665095 and 3665104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3665159) 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, 140954 + ... + 140979.

It is an arithmetic number, because the mean of its divisors is an integer number (986769).

Almost surely, 2^3665129 is an apocalyptic number.

It is an amenable number.

3665129 is a deficient number, since it is larger than the sum of its proper divisors (281947).

3665129 is a wasteful number, since it uses less digits than its factorization.

3665129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281946.

The product of its digits is 9720, while the sum is 32.

The square root of 3665129 is about 1914.4526632957. The cubic root of 3665129 is about 154.1806083650.

The spelling of 3665129 in words is "three million, six hundred sixty-five thousand, one hundred twenty-nine".