3640523 has 2 divisors, whose sum is σ = 3640524. Its totient is φ = 3640522.

The previous prime is 3640519. The next prime is 3640537. The reversal of 3640523 is 3250463.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3640523 - 2² = 3640519 is a prime.

It is not a weakly prime, because it can be changed into another prime (3640543) 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 as a sum of consecutive naturals, namely, 1820261 + 1820262.

It is an arithmetic number, because the mean of its divisors is an integer number (1820262).

Almost surely, 2^3640523 is an apocalyptic number.

3640523 is a deficient number, since it is larger than the sum of its proper divisors (1).

3640523 is an equidigital number, since it uses as much as digits as its factorization.

3640523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 23.

The square root of 3640523 is about 1908.0154611533. The cubic root of 3640523 is about 153.8348006430.

Subtracting from 3640523 its product of nonzero digits (2160), we obtain a palindrome (3638363).

Adding to 3640523 its reverse (3250463), we get a palindrome (6890986).

The spelling of 3640523 in words is "three million, six hundred forty thousand, five hundred twenty-three".