3640493 has 2 divisors, whose sum is σ = 3640494. Its totient is φ = 3640492.

The previous prime is 3640487. The next prime is 3640519. The reversal of 3640493 is 3940463.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3636649 + 3844 = 1907^2 + 62^2 .

It is a cyclic number.

It is not a de Polignac number, because 3640493 - 2¹⁴ = 3624109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3640993) 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, 1820246 + 1820247.

It is an arithmetic number, because the mean of its divisors is an integer number (1820247).

Almost surely, 2^3640493 is an apocalyptic number.

It is an amenable number.

3640493 is a deficient number, since it is larger than the sum of its proper divisors (1).

3640493 is an equidigital number, since it uses as much as digits as its factorization.

3640493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 3640493 is about 1908.0075995656. The cubic root of 3640493 is about 153.8343780794.

Subtracting from 3640493 its sum of digits (29), we obtain a square (3640464 = 1908²).

The spelling of 3640493 in words is "three million, six hundred forty thousand, four hundred ninety-three".