3869 has 4 divisors (see below), whose sum is σ = 3996. Its totient is φ = 3744.

The previous prime is 3863. The next prime is 3877. The reversal of 3869 is 9683.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9683 = 23 ⋅421.

It can be written as a sum of positive squares in 2 ways, for example, as 2500 + 1369 = 50^2 + 37^2 .

It is a cyclic number.

It is not a de Polignac number, because 3869 - 2⁴ = 3853 is a prime.

It is a super-2 number, since 2×3869² = 29938322, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 3869.

It is not an unprimeable number, because it can be changed into a prime (3863) 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, 17 + ... + 89.

It is an arithmetic number, because the mean of its divisors is an integer number (999).

2³⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

3869 is a deficient number, since it is larger than the sum of its proper divisors (127).

3869 is an equidigital number, since it uses as much as digits as its factorization.

3869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126.

The product of its digits is 1296, while the sum is 26.

The square root of 3869 is about 62.2012861603. The cubic root of 3869 is about 15.6987922854.

The spelling of 3869 in words is "three thousand, eight hundred sixty-nine".