3640685 has 12 divisors (see below), whose sum is σ = 4613148. Its totient is φ = 2757888.

The previous prime is 3640661. The next prime is 3640697. The reversal of 3640685 is 5860463.

It can be written as a sum of positive squares in 2 ways, for example, as 2253001 + 1387684 = 1501^2 + 1178^2 .

It is not a de Polignac number, because 3640685 - 2¹⁰ = 3639661 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 797 + ... + 2813.

It is an arithmetic number, because the mean of its divisors is an integer number (384429).

Almost surely, 2^3640685 is an apocalyptic number.

It is an amenable number.

3640685 is a deficient number, since it is larger than the sum of its proper divisors (972463).

3640685 is a wasteful number, since it uses less digits than its factorization.

3640685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2060 (or 2041 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 3640685 is about 1908.0579131672. The cubic root of 3640685 is about 153.8370824459.

The spelling of 3640685 in words is "three million, six hundred forty thousand, six hundred eighty-five".