3605645 has 4 divisors (see below), whose sum is σ = 4326780. Its totient is φ = 2884512.

The previous prime is 3605633. The next prime is 3605647. The reversal of 3605645 is 5465063.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5465063 = 139 ⋅39317.

It can be written as a sum of positive squares in 2 ways, for example, as 2725801 + 879844 = 1651^2 + 938^2 .

It is a cyclic number.

It is not a de Polignac number, because 3605645 - 2⁴ = 3605629 is a prime.

It is a super-3 number, since 3×3605645³ (a number of 21 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3605647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360560 + ... + 360569.

It is an arithmetic number, because the mean of its divisors is an integer number (1081695).

Almost surely, 2^3605645 is an apocalyptic number.

It is an amenable number.

3605645 is a deficient number, since it is larger than the sum of its proper divisors (721135).

3605645 is an equidigital number, since it uses as much as digits as its factorization.

3605645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721134.

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 3605645 is about 1898.8536015186. The cubic root of 3605645 is about 153.3419523615.

The spelling of 3605645 in words is "three million, six hundred five thousand, six hundred forty-five".