3768661 has 4 divisors (see below), whose sum is σ = 4058572. Its totient is φ = 3478752.

The previous prime is 3768643. The next prime is 3768673. The reversal of 3768661 is 1668673.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1668673 = 23 ⋅72551.

It can be written as a sum of positive squares in 2 ways, for example, as 2268036 + 1500625 = 1506^2 + 1225^2 .

It is a cyclic number.

It is not a de Polignac number, because 3768661 - 2⁷ = 3768533 is a prime.

It is a Duffinian number.

3768661 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3768661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3765661) 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, 144936 + ... + 144961.

It is an arithmetic number, because the mean of its divisors is an integer number (1014643).

Almost surely, 2^3768661 is an apocalyptic number.

It is an amenable number.

3768661 is a deficient number, since it is larger than the sum of its proper divisors (289911).

3768661 is a wasteful number, since it uses less digits than its factorization.

3768661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289910.

The product of its digits is 36288, while the sum is 37.

The square root of 3768661 is about 1941.3039432299. The cubic root of 3768661 is about 155.6189059618.

Subtracting from 3768661 its product of digits (36288), we obtain a palindrome (3732373).

The spelling of 3768661 in words is "three million, seven hundred sixty-eight thousand, six hundred sixty-one".