3640829 has 2 divisors, whose sum is σ = 3640830. Its totient is φ = 3640828.

The previous prime is 3640823. The next prime is 3640843. The reversal of 3640829 is 9280463.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2788900 + 851929 = 1670^2 + 923^2 .

It is a cyclic number.

It is not a de Polignac number, because 3640829 - 2²⁰ = 2592253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3640795 and 3640804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3640823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1820414 + 1820415.

It is an arithmetic number, because the mean of its divisors is an integer number (1820415).

Almost surely, 2^3640829 is an apocalyptic number.

It is an amenable number.

3640829 is a deficient number, since it is larger than the sum of its proper divisors (1).

3640829 is an equidigital number, since it uses as much as digits as its factorization.

3640829 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 3640829 is about 1908.0956474978. The cubic root of 3640829 is about 153.8391106583.

The spelling of 3640829 in words is "three million, six hundred forty thousand, eight hundred twenty-nine".