3651645 has 16 divisors (see below), whose sum is σ = 6031872. Its totient is φ = 1884480.

The previous prime is 3651623. The next prime is 3651653. The reversal of 3651645 is 5461563.

It is not a de Polignac number, because 3651645 - 2⁹ = 3651133 is a prime.

It is a super-2 number, since 2×3651645² = 26669022412050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3462 + ... + 4391.

It is an arithmetic number, because the mean of its divisors is an integer number (376992).

Almost surely, 2^3651645 is an apocalyptic number.

It is an amenable number.

3651645 is a deficient number, since it is larger than the sum of its proper divisors (2380227).

3651645 is a wasteful number, since it uses less digits than its factorization.

3651645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7892.

The product of its digits is 10800, while the sum is 30.

The square root of 3651645 is about 1910.9277851347. The cubic root of 3651645 is about 153.9912993342.

It can be divided in two parts, 36 and 51645, that added together give a triangular number (51681 = T₃₂₁).

The spelling of 3651645 in words is "three million, six hundred fifty-one thousand, six hundred forty-five".