3640249 has 2 divisors, whose sum is σ = 3640250. Its totient is φ = 3640248.

The previous prime is 3640243. The next prime is 3640289. The reversal of 3640249 is 9420463.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3636649 + 3600 = 1907^2 + 60^2 .

It is a cyclic number.

It is not a de Polignac number, because 3640249 - 2⁷ = 3640121 is a prime.

3640249 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (3640243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1820124 + 1820125.

It is an arithmetic number, because the mean of its divisors is an integer number (1820125).

Almost surely, 2^3640249 is an apocalyptic number.

It is an amenable number.

3640249 is a deficient number, since it is larger than the sum of its proper divisors (1).

3640249 is an equidigital number, since it uses as much as digits as its factorization.

3640249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 3640249 is about 1907.9436574490. The cubic root of 3640249 is about 153.8309411432.

The spelling of 3640249 in words is "three million, six hundred forty thousand, two hundred forty-nine".