3781009 has 4 divisors (see below), whose sum is σ = 3861504. Its totient is φ = 3700516.

The previous prime is 3781007. The next prime is 3781079. The reversal of 3781009 is 9001873.

3781009 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9001873 = 31 ⋅290383.

It is a cyclic number.

It is not a de Polignac number, because 3781009 - 2¹ = 3781007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3781007) 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, 40177 + ... + 40270.

It is an arithmetic number, because the mean of its divisors is an integer number (965376).

Almost surely, 2^3781009 is an apocalyptic number.

It is an amenable number.

3781009 is a deficient number, since it is larger than the sum of its proper divisors (80495).

3781009 is an equidigital number, since it uses as much as digits as its factorization.

3781009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80494.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 3781009 is about 1944.4816790086. The cubic root of 3781009 is about 155.7886822102.

The spelling of 3781009 in words is "three million, seven hundred eighty-one thousand, nine".