3640257 has 12 divisors (see below), whose sum is σ = 5274724. Its totient is φ = 2419200.

The previous prime is 3640249. The next prime is 3640289. The reversal of 3640257 is 7520463.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2178576 + 1461681 = 1476^2 + 1209^2 .

It is not a de Polignac number, because 3640257 - 2³ = 3640249 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3640257.

It is not an unprimeable number, because it can be changed into a prime (3640207) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5073 + ... + 5745.

Almost surely, 2^3640257 is an apocalyptic number.

It is an amenable number.

3640257 is a deficient number, since it is larger than the sum of its proper divisors (1634467).

3640257 is a wasteful number, since it uses less digits than its factorization.

3640257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280 (or 1277 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 3640257 is about 1907.9457539459. The cubic root of 3640257 is about 153.8310538321.

The spelling of 3640257 in words is "three million, six hundred forty thousand, two hundred fifty-seven".