3887681 has 4 divisors (see below), whose sum is σ = 4443072. Its totient is φ = 3332292.

The previous prime is 3887671. The next prime is 3887683. The reversal of 3887681 is 1867883.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3887681 is a prime.

It is a super-2 number, since 2×3887681² = 30228127115522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3887683) 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, 277685 + ... + 277698.

It is an arithmetic number, because the mean of its divisors is an integer number (1110768).

Almost surely, 2^3887681 is an apocalyptic number.

It is an amenable number.

3887681 is a deficient number, since it is larger than the sum of its proper divisors (555391).

3887681 is an equidigital number, since it uses as much as digits as its factorization.

3887681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555390.

The product of its digits is 64512, while the sum is 41.

The square root of 3887681 is about 1971.7203148520. The cubic root of 3887681 is about 157.2401830385.

The spelling of 3887681 in words is "three million, eight hundred eighty-seven thousand, six hundred eighty-one".