3778641 has 12 divisors (see below), whose sum is σ = 5779332. Its totient is φ = 2370816.

The previous prime is 3778637. The next prime is 3778651. The reversal of 3778641 is 1468773.

3778641 is a `hidden beast` number, since 3 + 7 + 7 + 8 + 641 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3294225 + 484416 = 1815^2 + 696^2 .

It is not a de Polignac number, because 3778641 - 2² = 3778637 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3778596 and 3778605.

It is not an unprimeable number, because it can be changed into a prime (3778651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12196 + ... + 12501.

It is an arithmetic number, because the mean of its divisors is an integer number (481611).

Almost surely, 2^3778641 is an apocalyptic number.

It is an amenable number.

3778641 is a deficient number, since it is larger than the sum of its proper divisors (2000691).

3778641 is a wasteful number, since it uses less digits than its factorization.

3778641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24720 (or 24717 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 3778641 is about 1943.8726810159. The cubic root of 3778641 is about 155.7561525653.

The spelling of 3778641 in words is "three million, seven hundred seventy-eight thousand, six hundred forty-one".