3656845 has 4 divisors (see below), whose sum is σ = 4388220. Its totient is φ = 2925472.

The previous prime is 3656843. The next prime is 3656857. The reversal of 3656845 is 5486563.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 736164 + 2920681 = 858^2 + 1709^2 .

It is a cyclic number.

It is not a de Polignac number, because 3656845 - 2¹ = 3656843 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3656843) 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 3 ways as a sum of consecutive naturals, for example, 365680 + ... + 365689.

It is an arithmetic number, because the mean of its divisors is an integer number (1097055).

Almost surely, 2^3656845 is an apocalyptic number.

It is an amenable number.

3656845 is a deficient number, since it is larger than the sum of its proper divisors (731375).

3656845 is an equidigital number, since it uses as much as digits as its factorization.

3656845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731374.

The product of its digits is 86400, while the sum is 37.

The square root of 3656845 is about 1912.2878967352. The cubic root of 3656845 is about 154.0643600106.

The spelling of 3656845 in words is "three million, six hundred fifty-six thousand, eight hundred forty-five".