3689881 has 4 divisors (see below), whose sum is σ = 3973732. Its totient is φ = 3406032.

The previous prime is 3689869. The next prime is 3689887. The reversal of 3689881 is 1889863.

It is a happy number.

3689881 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 an emirpimes, since its reverse is a distinct semiprime: 1889863 = 233 ⋅8111.

It can be written as a sum of positive squares in 2 ways, for example, as 467856 + 3222025 = 684^2 + 1795^2 .

It is a cyclic number.

It is not a de Polignac number, because 3689881 - 2⁷ = 3689753 is a prime.

It is a super-2 number, since 2×3689881² = 27230443588322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3689887) 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, 141906 + ... + 141931.

It is an arithmetic number, because the mean of its divisors is an integer number (993433).

Almost surely, 2^3689881 is an apocalyptic number.

It is an amenable number.

3689881 is a deficient number, since it is larger than the sum of its proper divisors (283851).

3689881 is a wasteful number, since it uses less digits than its factorization.

3689881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283850.

The product of its digits is 82944, while the sum is 43.

The square root of 3689881 is about 1920.9062965173. The cubic root of 3689881 is about 154.5269099170.

The spelling of 3689881 in words is "three million, six hundred eighty-nine thousand, eight hundred eighty-one".