3870781 has 4 divisors (see below), whose sum is σ = 4098492. Its totient is φ = 3643072.

The previous prime is 3870773. The next prime is 3870793. The reversal of 3870781 is 1870783.

It is a happy number.

3870781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3132900 + 737881 = 1770^2 + 859^2 .

It is a cyclic number.

It is not a de Polignac number, because 3870781 - 2³ = 3870773 is a prime.

It is a super-2 number, since 2×3870781² = 29965891099922, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3870721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113830 + ... + 113863.

It is an arithmetic number, because the mean of its divisors is an integer number (1024623).

Almost surely, 2^3870781 is an apocalyptic number.

It is an amenable number.

3870781 is a deficient number, since it is larger than the sum of its proper divisors (227711).

3870781 is a wasteful number, since it uses less digits than its factorization.

3870781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227710.

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 3870781 is about 1967.4300495824. The cubic root of 3870781 is about 157.0120076824.

The spelling of 3870781 in words is "three million, eight hundred seventy thousand, seven hundred eighty-one".