3640025 has 6 divisors (see below), whose sum is σ = 4513662. Its totient is φ = 2912000.

The previous prime is 3640019. The next prime is 3640027. The reversal of 3640025 is 5200463.

It can be written as a sum of positive squares in 3 ways, for example, as 753424 + 2886601 = 868^2 + 1699^2 .

It is a de Polignac number, because none of the positive numbers 2^k-3640025 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3639979 and 3640006.

It is not an unprimeable number, because it can be changed into a prime (3640027) 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 in 5 ways as a sum of consecutive naturals, for example, 72776 + ... + 72825.

It is an arithmetic number, because the mean of its divisors is an integer number (752277).

Almost surely, 2^3640025 is an apocalyptic number.

It is an amenable number.

3640025 is a deficient number, since it is larger than the sum of its proper divisors (873637).

3640025 is a wasteful number, since it uses less digits than its factorization.

3640025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145611 (or 145606 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 3640025 is about 1907.8849546029. The cubic root of 3640025 is about 153.8277857879.

Adding to 3640025 its reverse (5200463), we get a palindrome (8840488).

The spelling of 3640025 in words is "three million, six hundred forty thousand, twenty-five".