3781669 has 2 divisors, whose sum is σ = 3781670. Its totient is φ = 3781668.

The previous prime is 3781663. The next prime is 3781691. The reversal of 3781669 is 9661873.

3781669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3560769 + 220900 = 1887^2 + 470^2 .

It is a cyclic number.

It is not a de Polignac number, because 3781669 - 2¹³ = 3773477 is a prime.

It is a super-2 number, since 2×3781669² = 28602040851122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3781663) 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 as a sum of consecutive naturals, namely, 1890834 + 1890835.

It is an arithmetic number, because the mean of its divisors is an integer number (1890835).

Almost surely, 2^3781669 is an apocalyptic number.

It is an amenable number.

3781669 is a deficient number, since it is larger than the sum of its proper divisors (1).

3781669 is an equidigital number, since it uses as much as digits as its factorization.

3781669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 40.

The square root of 3781669 is about 1944.6513826391. The cubic root of 3781669 is about 155.7977463293.

The spelling of 3781669 in words is "three million, seven hundred eighty-one thousand, six hundred sixty-nine".