3765645 has 48 divisors (see below), whose sum is σ = 7246512. Its totient is φ = 1797120.

The previous prime is 3765631. The next prime is 3765661. The reversal of 3765645 is 5465673.

3765645 is a `hidden beast` number, since 3 + 7 + 6 + 5 + 645 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 1397124 + 2368521 = 1182^2 + 1539^2 .

It is not a de Polignac number, because 3765645 - 2⁵ = 3765613 is a prime.

It is a super-3 number, since 3×3765645³ (a number of 21 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 23907 + ... + 24063.

It is an arithmetic number, because the mean of its divisors is an integer number (150969).

Almost surely, 2^3765645 is an apocalyptic number.

It is an amenable number.

3765645 is a deficient number, since it is larger than the sum of its proper divisors (3480867).

3765645 is a wasteful number, since it uses less digits than its factorization.

3765645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222 (or 219 counting only the distinct ones).

The product of its digits is 75600, while the sum is 36.

The square root of 3765645 is about 1940.5269902787. The cubic root of 3765645 is about 155.5773817635.

The spelling of 3765645 in words is "three million, seven hundred sixty-five thousand, six hundred forty-five".