3684645 has 24 divisors (see below), whose sum is σ = 6562296. Its totient is φ = 1911168.

The previous prime is 3684643. The next prime is 3684647. The reversal of 3684645 is 5464863.

3684645 is a `hidden beast` number, since 3 + 6 + 8 + 4 + 645 = 666.

It is an interprime number because it is at equal distance from previous prime (3684643) and next prime (3684647).

It can be written as a sum of positive squares in 4 ways, for example, as 2259009 + 1425636 = 1503^2 + 1194^2 .

It is not a de Polignac number, because 3684645 - 2¹ = 3684643 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3684641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 559 + ... + 2771.

It is an arithmetic number, because the mean of its divisors is an integer number (273429).

Almost surely, 2^3684645 is an apocalyptic number.

It is an amenable number.

3684645 is a deficient number, since it is larger than the sum of its proper divisors (2877651).

3684645 is a wasteful number, since it uses less digits than its factorization.

3684645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2261 (or 2258 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 3684645 is about 1919.5429143418. The cubic root of 3684645 is about 154.4537832667.

It can be divided in two parts, 36 and 84645, that added together give a square (84681 = 291²).

The spelling of 3684645 in words is "three million, six hundred eighty-four thousand, six hundred forty-five".