3640522 has 4 divisors (see below), whose sum is σ = 5460786. Its totient is φ = 1820260.

The previous prime is 3640519. The next prime is 3640523. The reversal of 3640522 is 2250463.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2250463 = 67 ⋅33589.

It can be written as a sum of positive squares in only one way, i.e., 2105401 + 1535121 = 1451^2 + 1239^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 3640493 and 3640502.

It is not an unprimeable number, because it can be changed into a prime (3640523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910129 + ... + 910132.

Almost surely, 2^3640522 is an apocalyptic number.

3640522 is a deficient number, since it is larger than the sum of its proper divisors (1820264).

3640522 is a wasteful number, since it uses less digits than its factorization.

3640522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1820263.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 3640522 is about 1908.0151991009. The cubic root of 3640522 is about 153.8347865576.

Adding to 3640522 its reverse (2250463), we get a palindrome (5890985).

The spelling of 3640522 in words is "three million, six hundred forty thousand, five hundred twenty-two".