3640243 has 2 divisors, whose sum is σ = 3640244. Its totient is φ = 3640242.

The previous prime is 3640223. The next prime is 3640249. The reversal of 3640243 is 3420463.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3640243 - 2¹³ = 3632051 is a prime.

It is not a weakly prime, because it can be changed into another prime (3640249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1820121 + 1820122.

It is an arithmetic number, because the mean of its divisors is an integer number (1820122).

Almost surely, 2^3640243 is an apocalyptic number.

3640243 is a deficient number, since it is larger than the sum of its proper divisors (1).

3640243 is an equidigital number, since it uses as much as digits as its factorization.

3640243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 3640243 is about 1907.9420850749. The cubic root of 3640243 is about 153.8308566265.

It can be divided in two parts, 3640 and 243, that added together give a palindrome (3883).

The spelling of 3640243 in words is "three million, six hundred forty thousand, two hundred forty-three".