3765661 has 2 divisors, whose sum is σ = 3765662. Its totient is φ = 3765660.

The previous prime is 3765631. The next prime is 3765673. The reversal of 3765661 is 1665673.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2785561 + 980100 = 1669^2 + 990^2 .

It is a cyclic number.

It is not a de Polignac number, because 3765661 - 2⁷ = 3765533 is a prime.

3765661 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3765611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1882830 + 1882831.

It is an arithmetic number, because the mean of its divisors is an integer number (1882831).

Almost surely, 2^3765661 is an apocalyptic number.

It is an amenable number.

3765661 is a deficient number, since it is larger than the sum of its proper divisors (1).

3765661 is an equidigital number, since it uses as much as digits as its factorization.

3765661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 34.

The square root of 3765661 is about 1940.5311128658. The cubic root of 3765661 is about 155.5776021096.

The spelling of 3765661 in words is "three million, seven hundred sixty-five thousand, six hundred sixty-one".